Three men in London compete for the love of a dance-hall girl.

After a jeweler hires a private detective to help him find $50,000 missing from his company, he is murdered while attending a society party; and the private eye, aided by his comely secretary, vies with a bumbling police detective to find the murderer among several suspects, including the dead man's daughter, her current husband, her former husband, and an ex-convict.

两个总是互相较劲的水手同时看上了同一个女孩。当她选择了其中一人时，他们的友谊不欢而散。然而，当其中一人被困在海底的潜艇中，而另一人作为潜水员被派去执行救援任务时，事情发生了变化。