The story is about Arun (Ganesh), an unemployed teacher who comes across an advertisement offering a job at the Laxmi School with the proviso that only married couples need apply. He meets Miss Mary (Meena Kumari), a Christian girl who is badly in need of a job to pay off her parents' debt. Arun suggests that she pose as his wife after he witnesses her getting harassed by John (Randhir), her potential suitor to which her father owes money. They hire Nakdau (Om Prakash), a beggar-cum-conman as a servant to keep up the pretense. The school owners (Rai Saheb and his wife), are looking for their long lost daughter Laxmi (hence the Laxmi School), who went missing sixteen years ago and the only thing tying her to them is a locket and an identification mark in the form of a mole on her left foot. They employ a detective Raju (Kishore Kumar) and his sidekick Chandragupta (Maruti) to find her. Raju is an orphan brought up as a nephew by the Rai Saheb. The old couple find a resemblance in Mary to their daughter and show her a photo of Laxmi that looks like her. Mary tells them that she can't be their daughter as she was brought up in a Christian environment by Christian parents.

Mary feels bad for lying about her married status to the Rai Saheb and his wife. She and Arun start liking each other in spite of their constant bickering. The owner's other daughter and Mary's biological sister Sita (Jamuna) has a fondness for Arun which upsets Mary. There are several comic sequences involving Raju and Chandragupta. The truth is revealed about Mary being the Rai Saheb's daughter Laxmi when her foster parents arrive.[6]