Donald finds a magic whistle that summons Parthenope the siren, who proceeds to grant wishes to the Duck family. Donald's extravagant wishes attract the attention of the authorities, curious about his sudden unexplained wealth and it's up to the boys to figure out how to resolve the situation.
Donald doesn't like the owl that the nephews have adopted, but when the family is shrunk to tiny size by two well-armed robbers, it's the bird that saves them.