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.
At the height of World War II, the Germans begin dropping a new type of booby-trapped bomb on England. Sammy Rice, a highly-skilled but haunted bomb-disposal officer, must overcome his personal demons to defeat this new threat.