A renowned actress, Aswathi, is murdered. When a CBI officer, Sethurama Iyer, investigates the case, he unravels a dark secret about Aswathi which brings forth several complexities.

A string of mysterious murders happen in an aristocratic mansion. The owners of the mansion seek CBI officer Sethurama Iyer's help to find the person responsible for the deaths.

Alex, who is awaiting execution, confesses to having committed six out of the seven murders he is acquitted for. Officer Sethurama Iyer decides to trace the original murderer of the seventh one.