Harpo is a true patron of the arts, taking from the rich to help feed a group of poor actors who are struggling to open a new musical without financial backers. When he steals a tin of sardines from a classy Fifth Avenue market (hot delicacies in the front - hot diamonds in the back!), he unknowingly makes off with the missing Romanoff diamonds, smuggled into the country [in a tin of sardines] by a sinful yet scintillating jewel thief. She traces the tin back to the theater where she backs the show, hoping to recover the diamonds... and nearly brings the house down in a madcap race to retrieve the jewels on opening night!