Postmortem offers a gripping storyline that maintains audience interest through its investigative thriller format. The screenplay is straightforward, focusing on the procedural aspects of the crime while interspersing character-driven moments. The pacing is steady, with the first half setting up the mystery effectively, though it occasionally slows down due to extended dialogues and exposition.

The second half picks up momentum, delivering tighter sequences and heightened tension as the investigation progresses. The film benefits from solid performances that add depth to the narrative, although some subplots feel underdeveloped. The absence of songs is notable, which keeps the focus on the story but may affect the entertainment quotient for some viewers.

Musically, the film lacks a dedicated music director credit, and the background score is minimalistic, serving primarily to enhance the suspense without overpowering scenes. The cinematography by K. B. Dhayalan captures the mood well, using lighting and framing to complement the thriller atmosphere.

Prem Nazir: Delivered a restrained and convincing portrayal of the lead investigator, anchoring the film with his experience.

Mammootty: Showcased early signs of his versatility with a compelling supporting role that added intensity to the narrative.

Sukumaran: Provided solid support, effectively portraying a character caught in the web of the unfolding mystery.