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.
Railway Anti-Criminal Task Force (RATs) investigates three unrelated murders happened in a train.
Anandakuttan (Jayaram) goes to Kovilpatti to invite his estranged sister to his wedding and meets his niece Parvathy (Roja). Not knowing he is engaged, Parvathy falls for Anandakuttan
