Convinced that his life is in jeopardy, Satyakam, the son of a business magnate hailing from Mussoorie, approaches Byomkesh with a plea for help. The legendary detective soon heads to Mussoorie, where he finds out that the youngsters worst fears have come true. Can Byomkesh unravel the mystery shrouding Satyakam's murder before it is too late?

Byomkesh, a detective, stumbles upon a case of robbery while recuperating from a prolonged illness. With the only object to be stolen being a group photograph, he attempts to solve the mystery.

Famed detective Byomkesh Bakshi investigates the murder of a man who had just thrown a party to celebrate his recovery from a long illness.

The film starts with the hint of another story 'Satyanweshi' where young Byomkesh caught the head of a cocaine racket who is now seeking revenge. On the other hand, a young girl dies in mysterious condition having a match stick in her hand. One Kokonad Gupta, who claims to be a fan of Byomkesh gifts him a matchbox.