The socially prominent Trenholms, on their last financial legs, place their hopes in an alliance with wealthy Lucille Spinney. Peter threatens to wreck the hope by imbibing too freely at the wrong time, and his sister Alice arranges a party at which he is scheduled to propose to Lucille. Instead, he is confined to his room. Alice conscripts Marty Conrad, a stranger, who is Peter's double, and who agrees to impersonate Peter until he is sober. The plan works, but it is Alice, not Peter, who saves the family prestige.