After naval sergeant Pekka Kuusisto runs into his old crush, nurse Leila, she stays on his mind as he embarks on a submarine combat exercise.
Irmeli wants a certain job as a secretary but finds out that she would have to be married in order to get the vacancy. She lies that she has recently married and then gets a stranger from a nearby restaurant to pose as her husband. Complications arise when they have to continue their charade.
