When his colleague presents him with (forged) evidence of his wife Sylvette's unfaithfulness, factory owner Jean Sourdier kills him in a fit of rage. After fifteen years in prison he is determined to take revenge on his wife by killing Ninette, a daughter from her second marriage.
Peter Gruber, a young tenor from Vienna, gives piano lessons to Daisy, the daughter of a dentist. They fall in love and when Gruber has to perform in Antwerp, Daisy follows him there. She pretends to be an American musician and manages to get a job with Gruber's orchestra. Daisy's worried father sets off in pursuit of his daughter, accompanied by a certain miss Lola.
Hugo Writley, the son of an American shipping magnate, travels to Holland accompanied by his steward, Longway. On the night of their arrival they go to a cabaret, where they get into conversation with two men and their girlfriends who, at closing time, invite the Americans to their home for a few drinks. The hosts, however, turn out to be 'land-sharks' planning to strip the two inebriated Yankees of their cash.
