Her education in a French convent school completed, plain Justine Spencer returns to New York. There she is shocked to discover that her mother Dodo is a flamboyant musical comedy actress with many male admirers.

Adventuress Leonie Sobatsky falls in love with a young man named Nevil Trask, and he with her. Trask doesn't know that Leonie is actually the head of an international smuggling ring--and Leonie doesn't know that Trask is an undercover Secret Service agent assigned to break up the ring and capture its head.