Near the end of World War II, a secret American raid on an enemy transportation hub goes very wrong when a turncoat warns the enemy. Led by Capt. Webster Carey, the mission causes the deaths of many bystanders -- among them, Carey believes, his Italian girlfriend, Giulia de Graffi. Back home, Carey stumbles across evidence that might uncover the identity of the informant. But, when he returns to Italy to get even, Carey is stunned by what he finds.

The Bellows family causes comic confusion on an ocean liner, with time out for radio-style musical acts.

An upper-class female reporter is (despite herself) attracted to a hulking laborer digging a tunnel under the Hudson River.

In Panama, Maggie King meets soldier Skid Johnson on his last day in the army and reluctantly agrees to a date to celebrate. The two become involved in a nightclub brawl which causes Maggie to miss her ship back to the States. Now stranded, she's forced to move in with Skid and his pal Harry. She soon falls in love with Skid. Skid gets a job playing the trumpet at a local club and becomes a big success. Fame and fortune go to his head which eventually destroys his relationship Maggie and his career.