A British Sanitary Engineer, goes on holiday with a set of plans for a new secret weapon which he has mistaken for his new plumbing invention. Everyone is hunting for him, including the Russians. The Russians find him and offer him a job in the Kremlin doing research (on plumbing he believes). He accepts, arrives in Russia and falls in love with Tania, a secret agent. And then discovers the true nature of the plans he is carrying...

Sergeant Jack Hardacre returns from the war to his contemptible fiancée Janey Jenkins intending to reconcile with her against all odds. But he falls in love with a charming new lodger Milly Southern instead.

Tom Masterick, a dock worker, is wrongfully convicted of a murder charge. His death sentence is commuted to a long prison term. When released as an old man, he vows to find the real killer.