Edmund Gwenn is a compulsive gambler whose wife has just passed away. His daughter, Katharine Hepburn, has stolen some expensive lace, so he decides to smuggle it out of France. She wants to leave with him, but the cops are looking for her, and all the borders are being watched, so she
decides to masquerade as a boy. She cuts her hair short and does her best to swagger mannishly as they board a ship bound for England. Gwenn drinks too much en route and reveals the lace robbery to Cary Grant, a cockney jewel smuggler. Grant informs customs inspectors in order to divert attention
from himself. To keep from being jailed, Gwenn has to give the officials every cent he h...