Gloria (Deanna Durbin) is the loneliest girl at her boarding school. Her mother (Gail Patrick) is a glamorous Hollywood star - but if anyone knew she had a secret teenage daughter it would ruin her career. Forbidden to talk about her mother, Gloria invents an imaginary dad who's a famous explorer. When her classmates start to see through her elaborate charade, however, her fantasy world starts to come tumbling down. In desperation, she approaches a complete stranger (Herbert Marshall) at a railway station and begs him to pretend to be her daddy! Luckily, he agrees - and is soon regaling all her school friends with the wildest of tall tales! Now, Gloria decides it's time for a grand reunion - with her real mother.