5 Best Malayalam Investigation Thriller Movies on OTT (April 2026) – Ranked By OTT Ratings

5 Best Malayalam Investigation Thriller Movies In 2026 – If you are looking for malayalam investigation thriller movies, then this article could serve as the ultimate solution for you. Today, OTT Ratings is here to introduce you to some of the latest malayalam crime investigation movies. These are all movies and web series released in 2026, which are readily available on various OTT platforms. You will be even more pleased to learn that all the movies included in this list are highly rated by websites like IMDb.

This entire list of movies has been curated by OTT Ratings which is a one and only dedicated OTT rating, reviews and OTT news website.  Which always follows a rigorous and meticulous review process. We always strive never to waste our readers’ time, and we consistently recommend only the very best OTT content to our readers. This is the only reason our readers from around the world believe and trust in our views.

So let’s get on to the main topic which is to uncover “ 5 Best Malayalam Investigation Thriller Movies” released in 2026 on OTT.

5 Best Malayalam Investigation Thriller Movies to Watch in 2026

S.No	Movie Title	Release Date	IMDb Rating	Key Investigation Plot	OTT Platform
1	Rekhachithram	January 2026	7.8/10	40-year-old unidentified victim case	Sony LIV
2	Kalamkaval	December 2025/January 2026 OTT	7.6/10	Police probe into a complex murder	Sony LIV
3	Sambhavam Adhyayam Onnu	March 6, 2026	7.2/10	Mystery unraveling hidden truths	Amazon Prime
4	Dheeram	March 2026	~6.8/10	ACP uncovers serial killer pattern	Prime Video
5	Valathu Vashathe Kallan	January 30, 2026	6.6/10	Crime scene dissection and twists	Manorama Max

Read More – 10 Best Movies on Amazon Prime Video You Haven’t Watched Yet (Hindi & English)

1. Rekhachithram                                                             

Even his dreams are all about Rekha!

Watch #Rekhachithram On Sony Liv #RekhachitramOnSonyLIV#AsifAli #AnaswaraRajan #ManojKJayan #ZarinShihab #BhamaArun #Sidhique #MeghaThresiammaThomas #JofinTChacko pic.twitter.com/KPQPyNTUMP

— Sony LIV (@SonyLIV) March 31, 2025

This is going to be the first movie on our list that we have personally watched and that is why we have placed it at the very top of the entire list.The film “Rekhachithram” depicts a middle-aged man named Rajendra sitting beneath a tree in the middle of a forest. From this location, he goes live on Facebook to make a confession, a revelation that leaves viewers stunned during the live stream. He discloses that, 40 years earlier in 1985, during the filming of a Malayalam movie, he with the other two members murdered a young woman named Rekha and buried her right beneath the very tree where he is currently seated.

Following this confession, the man shoots himself, committing suicide. Subsequently, a skull is discovered buried beneath the tree. When news of this incident leaks to the media, it sparks widespread panic among the public. “Rekhachithram” is an investigative mystery-thriller that stands as one of the most successful Malayalam movies till date. Driven by the strength of its storyline and performances, the movie has grossed ₹75 crore at the box office. Furthermore, you might be surprised to learn that the film’s producers have already realized a return on investment of 350 percent. Thus, you can well imagine what a phenomenal crime investigation thriller this Malayalam movie truly is.

Important Detail About Rekhachithram

• IMDb Rating: 7.2/10
• OTT Platform: SonyLiv
• Duration: 2h 10m 
• Cast: Askar Ali, Bhavana, Lal
• Director: Jithu K. Jayan 
• Languages: Malayalam, English subs
• Genre Tags: Investigation Thriller, Crime Mystery,  Adventure 

2. Kalamkaval

Stanley das and his prey's😈#Mammootty #Kalamkaval pic.twitter.com/cVXRVkM366

— Btwits_Akash (@btwits_Akash_) January 23, 2026

If you are a fan of Mammootty and have so far only seen him in the role of a conventional hero. Then our next movie will compel you to think about him in a completely different character. Yes, we are talking about the movie Kalamkaval, which is one of the best Malayalam Investigation Thriller Movies that narrates the bloody saga of a psycho killer. The story begins in a small village in Kerala, where, for some time now, numerous young women have been going missing one after another. To investigate these missing women cases. The case is assigned to a police officer named Jay Krishna. Who is supported by a special task force. As Inspector Jay Krishna delves deeper into the investigation, he uncovers a common thing linking to all the missing women cases. He finds out that women who are either widowed, divorced, or of a relative in the upper mid age but remain unmarried are missing.

Furthermore, it appears that a single psycho-killer is responsible for all these murders. If this storyline sounds somewhat familiar to you, you will find that its first half bears a striking resemblance to the Bollywood film “Bhagavath”. However, let us assure you that the second half of the story is entirely distinct, featuring unusual twists and turns that build a different & unique Malayalam Investigation Thriller Movies . Mammootty’s performance is magnificent; his acting prowess and screen presence are simply unparalleled.

Important Detail About Kalamkaval

• IMDb Rating: 7.6/10 
• OTT Platform: SonyLiv
• Duration: 2h 18m 
• Cast: Mammootty, Vinayakan, Grace Antony
• Director: Shaji Azeez 
• Languages: Malayalam, Telugu, Kannada

3. Sambhavam Adhyayam Onnu

Presenting the JioHotstar official trailer of Sambhavam Adhyayam Onnu starring Askar Ali, Vineeth Kumar and Sidharth Bharathan. Streaming exclusively on JioHotstar from April 15.#SambhavamAdhyayamOnnu #Trailer #Thriller #Mystery #Drama #MalayalaMovie #JioHotstar… pic.twitter.com/BFtGtdlRGb

— JioHotstar Tamil (@JioHotstartam) April 11, 2026

In our list of Malayalam investigation thriller movies is “Sambhavam Adhyayam Onnu” on 3rd number. The story follows Anand Ram, a police officer who is transferred from one city to another. Along the route lies a dense, eerie forest shrouded in mystery. It is here that a road accident occurs, during which he rescues an officer from the Tamil Nadu Police. However, the story does not end there. As the journey through the forest continues, a series of bizarre and inexplicable events unfold. In our opinion, these occurrences are deeply enigmatic and packed with suspense elements. That makes the narrative truly sensational and keeps you connected with the screen until the end of the story.

Important Detail About Sambhavam Adhyayam Onnu

• IMDb Rating: 7.2/10 
• OTT Platform: Amazon Prime
• Duration: 2h 10m 
• Cast: Askar Ali, Bhavana, Lal
• Director: Jithu K. Jayan 
• Languages: Malayalam, English sub

4. Dheeram

OUT NOW | #Dheeram

Streaming on Simply South worldwide, excluding India.

▶ https://t.co/PIwe3b992e pic.twitter.com/6b16NlVWLk

— Simply South (@SimplySouthApp) April 2, 2026

The fourth film on our list named “Dheeram” is one that will compel you to ponder: who, ultimately, is in the right, and who is in the wrong? Was true justice actually served? As for the plot, the story begins with a serial killer who selectively targets and murders people on specific days, leaving behind bizarre clues at the crime scenes in an attempt to mislead the police. ACP Stalin, who is the main character of the movie and leading the investigation, begins to probe these brutal killings.

As the investigation progresses, a terrifying secret from the past is unveiled. Throughout the narrative, numerous murders occur, and many deep secrets come to light. If you wish to discover why these killings are taking place and who is behind them, you absolutely must watch this series. It holds a strong rating on IMDb, which is why we have placed it at number four on our list.

Important Detail About Sambhavam Adhyayam Onnu

• IMDb Rating: 6.8/10 
• OTT Platform: Amazon Prime
• Duration: 2h 20m 
• Cast:  Indrajith Sukumaran, Tanvi Ram, Jagathy Sreekumar
• Director: R. Prasanth
• Languages: Malayalam, Hindi dub

5. Valathu Vashathe Kallan

The final film featured in this article is “Valathu Vashathe Kallanj”. Directed by the highly acclaimed Malayalam filmmaker Jeethu Joseph, who has previously helmed numerous gripping suspense thrillers. This movie promises intense suspense and stands as a quintessential Malayalam crime investigation film. The plot centers on a young woman who vanishes under mysterious circumstances. The case is assigned to Anthony Xavier in the movie by Biju Menon, a corrupt police officer. Meanwhile, the missing woman’s father finds his life thrown into turmoil following his daughter’s disappearance. As Anthony Xavier begins to probe the matter and advance the investigation, the father, lacking faith in the officer, decides to launch his own parallel inquiry. 

This leads to a clash between the police and the father. The story is truly mind-boggling, featuring such intricate twists and turns that, at every juncture, nearly everyone appears to be entangled in a conspiracy. While the first half is engaging, the second half elevates the viewing experience to an entirely new level. This film serves as a perfect example of a Malayalam investigative thriller and is an absolute must-watch.

Important Detail About Valathu Vashathe Kallanj

• IMDb Rating: 6.6/10 
• OTT Platform: Manorma Max
• Duration: 2h 20m 
• Cast:  Joju George, Priyamani, Vinay Rai
• Director: Jeethu Joseph 
• Languages: Malayalam, Tamil, Hindi 

Read More – 25 Must Watch Best Malayalam Suspense Thriller Movies (2026) in OTT | OTT Ratings

Why Watch Malayalam Investigation Thriller Movies?

Malayalam cinema has carved out a distinct niche for itself across the globe. In particular, one genre that holds a special appeal for audiences and which is the focus of this article—is the Malayalam crime thriller and investigative film.

Below, we have briefly explained why this category is truly remarkable and worthy of capturing the attention of viewers like you:

• 1. Rooted in Realistic Storytelling – In most Malayalam movies, you must have surely noticed that the script of the stories are based on the lives of common people and, for the most part, inspired by real-life events. And the other side Bollywood movies tend to prioritize action and romance. In Malayalam Investigation thriller movies, the police’s operational methods and the true motives of the characters feel authentic and realistic. Allowing audiences to connect with the story consequently, viewers are able to deeply understand narrations and truly enjoy the storytelling experience.
• 2. Strong Script-Driven Narratives – Prioritizing scripting above all other elements is a primary reason for the popularity of Malayalam thriller movies. In these films, the mystery is meticulously woven together, step by step; clues are often strategically interspersed throughout the narrative, ensuring that the final resolution does not feel contrived or forced. This is precisely what makes Malayalam investigation thrillers movies become more popular compared to other regional movies.
• 3. Exceptional Performances of The Cast – In Malayalam investigative thrillers movies, the performances of seasoned artists from the industry, such as actors like Mammootty and Inderjeet often elevate these movies to an entirely different level. Nowadays, new actors are also featuring in these movies, infusing Malayalam crime thrillers with a sense of freshness and uniqueness. Indeed, top-notch acting makes these films even more intense. 
• 4. Unique Regional Context – Most Malayalam investigative thrillers stories are based on famous parts from South India. Such as the dense forests of Kerala or quaint coastal villages. Which renders the storytelling even more realistic and vivid.
• 5. OTT Availability – The all Malayalam Investigation Thrillers movies are widely available on all major OTT platforms in 2026 at multiple dubbed versions like Amazon Prime, Sonyliv, Zee5, Jiohotstar and Manorama Max. This means that you can easily stream Malayalam thriller movies anytime.
  

How To Choose Best Malayalam Investigation Thriller Movies To Watch?

As always, we curated the list adding the highly rated and reviewed movies in our recommendations as we always prioritize saving our reader precious time. However, we advised you if you want to choose the best malayalam investigation thrillers so you can go through the highest rating to lower and also you can go with the cast vise selection. If you want to see the best Malayalam investigation thriller movies as per our own recommendation. You can choose Rekhachithram, Kalamkaval, Sambhavam Adhyayam Onnu, Dheeram, and Valathu Vashathe Kallan. All these movies are highly rated on all movie ratings websites like IMDB and rotten tomatoes.

 

Where to Watch These Malayalam Investigation Thriller Movies?

All these Malayalam investigation thriller movies are widely available on best OTT platforms like Amazon Prime, JioHotstar, Zee5 and manorama max. Also these movies come with the dubbed version in Hindi, Tamil, Telugu and in other languages too. However, keep this in mind these movies can be watched or streamed through only the paid subscription.

Are Malayalam investigation thriller movies suitable for non-Malayalam audiences?

Yes, all Malayalam Investigation thrillers movies 2026 are suitable for non-malayalam audiences. These movies are listed on the all popular OTT platform with English subtitles and in the dubbed version in popular languages of India like Hindi, Tamil, Telugu etc. The story, universal themes of crime and justice, mystery and thriller make them attractive and accessible for all kinds of viewers around the world.

Conclusion 

In conclusion, Malayalam investigation thriller movies establish themselves as  one of the finest crime movies created in the Indian entertainment industry. These 5 best Malayalam thrillers movies added in this article like Rekhachithram, Kalamkaval, Sambhavam Adhyayam Onnu, Dheeram, and Valathu Vashathe Kallan are all some of the strong examples of what makes this category so compelling. These movies come up with the unique investigation plot, powerful performances, and the kind of intelligent storytelling that keeps viewers hooked from the beginning to the end of the story.

No matter, if you are watching the Malalyam movies for the first time or you are a long time fan of the same, these movies are best for both of the viewers. All of these movies are widely available on all major OTT platforms like Sony LIV, Amazon Prime Video, and Manorama Max, making it easier than ever to stream them at your convenience. So if you are in the mood for a gripping crime investigation experience, any one of these Malayalam Investigation thriller movies will be worthy to watch. Stay tuned to OTT Ratings for more curated recommendations and honest reviews of the best OTT content across all languages.

Frequently Asked Questions (FAQs) – Best Malayalam Investigation Thriller Movies 2026