During World War I, a professional thief known as The Lone Wolf is assigned to steal a cylinder with important information from behind the German lines and bring it to Allied intelligence headquarters. However, German agents set out to stop him, headed by the man who was responsible for the death of the thief's sister.

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。