Panos Pampanos leads a double life. To Thaleia, the daughter of his best friend and his protégé, he presents himself as a man of strict principles and unwavering morals. In reality, he’s an incorrigible party-goer, hiding behind the persona of an imaginary nephew.

When the aunt of his business partner Dinos Kaliampesis, Mrs. Angela Avgerinou, arrives in Athens from Johannesburg, Panos falls in love with her daughter, Gianna, and tries to make his fictitious nephew disappear. However, Dinos also falls in love with Thaleia, whom he mistakenly believes to be Panos' former girlfriend.

Misunderstandings pile up as Thaleia believes Dinos is Panos' nephew, while Gianna assumes Thaleia is Panos' fiancée. In the end, order is restored: Panos marries Gianna, and Dinos marries Thaleia.