Two old sea dogs are fighting to the teeth for customers for a coastal cruise. Three crooks turn up at the resort and try to get a briefcase full of valuable jewelry out of the three-mile zone. A rich "Frenchwoman" is also involved in the affair. An insurance agent mingles with the tourists without being recognized in order to track down the jewel thieves.

Two rival gangs try to obtain the five parts of a dangerous formula held by five scientists.

After his wife's accidental death, the once successful pop singer Eric Kersten and his son Peter retired to Lake Maggiore. He spends his time painting pictures that he sells to tourists. One day he meets the pretty Eva, who looks very much like his late wife. He falls in love with her without knowing that his producer sent her to bring him back to music.

WWII is entering its last phase: Germany is in ruins, but does not yield. The US army lacks crucial knowledge about the German units operating on the opposite side of the Rhine, and decides to send two German prisoners to gather information. The scheme is risky: the Gestapo retains a terribly efficient network to identify and capture spies and deserters. Moreover, it is not clear that "Tiger", who does not mind any dirty work as long as the price is right, and war-weary "Happy", who might be easily betrayed by his feelings, are dependable agents. After Tiger and another American agent are successfully infiltrated, Happy is parachuted in Bavaria. His duty: find out the whereabouts of a powerful German armored unit moving towards the western front.