Twins Adam and Eva are so alike, it is impossible to tell them apart, which enables the malicious Eva to get away with all sorts of naughty tricks and leave the blame to fall on Adam. The pair grows up and Adam decides to pay Eva back for the tricks she played on him in the past. When he discovers that the handsome Dr. Prokop Novotný is interested in Eva, he dresses up as Eva and startles the suitor.