Abraham Ozler

ACP Abraham Ozler is on vacation with his wife Anisha and daughter Jenny. He receives a call informing him of a double murder, prompting him to leave immediately. Mid-journey, he realizes the call was a hoax and rushes back home, only to find his wife and daughter missing.

Vineeth, a drug addict, admits to kidnapping Anisha and Jenny, hacking their bodies into pieces, and burying them in a forest. He claims that drugs affected his memory, making it difficult to locate the burial sites. Ozler is distraught, seeking closure but finding none.

Three years after the kidnapping, Ozler remains a depressed insomniac haunted by hallucinations. He continues to visit Vineeth in prison, seeking answers about his wife and daughter's remains. Meanwhile, he investigates the series of murders committed by the enigmatic 'Birthday Killer'.

A series of murders are committed by the 'Birthday Killer', who leaves birthday cards with a cryptic Latin quote at each scene. The killer's pattern puzzles the police, leading them to suspect a connection between the victims and the quote, hinting at hidden motives.

Investigations uncover Krishnadas, a man using an artificial larynx, as a key suspect in the murders. He was a prodigious singer who lost his voice due to a surgery mishap. Meanwhile, other suspects like Alexander and Xavi emerge, connected through their past in medical school.

Flashbacks reveal the rivalry and animosity among medical students: Alexander, Xavi, Shivakumar, and Selvaraj. Alexander and Xavi's jealousy and professional conflicts, combined with Shivakumar's romantic pursuits and Selvaraj's drug addiction, lead to violent confrontations.

During Krishnadas's tumor surgery, Alexander, assisted by Xavi, is forced to take the lead. Xavi, driven by jealousy, cuts Krishnadas's vocal cords, causing permanent damage. This act triggers a series of events leading to Alexander's coma and the subsequent framing of Xavi and others.

Alexander is left in a coma after being assaulted by the jealous students. When he awakens years later, he suffers from dissociative amnesia, losing most of his memories of the past, including Suja, Xavi, Shivakumar, and Selvaraj. Over time, he begins to piece together his suppressed memories.

Alexander recalls his past after seeing a TV program about Krishnadas singing. He reconnects with Krishnadas, and they collaborate to plan the murders. Alexander's involvement begins to surface as he manipulates events, ultimately leading to the murders of his past rivals.

Xavi dies of cardiac arrest during his autobiography launch. Before dying, Xavi reveals that Alexander poisoned the victims with bacteria-infected surgical ink, implicating him in the murders. The police uncover evidence linking Alexander to the crimes.

Ozler learns about a shared past involving Shivakumar, Selvaraj, and the other victims from their medical college days. Xavi’s death and Selvaraj’s breakdown reveal a pattern connected to their medical history and unresolved conflicts.

Ozler encounters Alexander and Krishnadas and is warned with the phrase 'Bone Residue'. This cryptic clue points to the importance of bone debris in the murders. Vineeth challenges Ozler to uncover the truth hidden behind the brutal killings.

It is revealed that Alexander had poisoned his victims with infected surgical ink, with a motive rooted in his traumatic past and desire for vengeance. The murders are linked to his fractured memories and unresolved trauma from his medical college days.