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Tomboy Phillipa (Gladys Walton) isn't thrilled with the exploits of her flirtatious-but-married sister Ericka (Maude Wayne). During a house party thrown by the girls' parents, Ericka makes a date to meet a stranger on his yacht. Phillipa puts a halt to this by locking her up and going to the yacht herself. Ericka manages to get out and asks another guest, Captain Chantry (Louis Willoughby), to go to the yacht after Phillipa. What she doesn't know is that the so-called Captain is really a Raffles-like crook who has been planning to steal jewelry from several of the house guests. But Chantry agrees to the errand and saves Phillipa from the lecherous yachtsman. After that she trusts him so completely it inspires the thief to go straight. The two girls keep him from being arrested and he goes off, promising to come back when he has become worthy of their company. It probably isn't necessary to mention that this picture has nothing to do with the 1983 film of the same name (incidentally, two other unrelated pictures with the same title were made in 1928 and 1939).