Darpanarayan Chaudhury is the patriarch of a traditional aristocratic family. He has three sons and a daughter and is a widower. He is very reserved and has old ideas which includes being against love marriages. He wants to test the character of his children so he employs a detective Rahul to keep a check on his children.Rahul falls in love with Sujata and comes to know the real characters of Darpanarayan’s children as no one is clean. However he protects them and tells a different story to Darpanarayan as he wants to protect their family honour.Darpanarayan is forced to change his views and sheds his old ideas and beliefs and gets Sujata married to Rahul.