During a vacation in the United Kingdom, Harrison "Harry" Fox, Sr. and Harrison Fox, Jr. inadvertently become the prime suspects in a murder case, and must go on the run in the British countryside with the whole of the police force on their trail.

Dr David Farr, a friend of Harrison's, is accused of planting a bomb in a colleague's car that killed him.

Harry is hired by a midget wrestler (Tommy Madden) who's been receiving death threats. His investigation leads to a promoter (Vera Miles) who's afraid somebody wants to blow up her arena. Harry races against a time bomb to flush out someone eager to end a wrestling promoter's (Vera Miles) career.

When Harry (Jack Warden) tries to return a stolen wallet he recovered from a pickpocket, he stumbles onto a murder. Harry is baffled over conflicting evidence involving a wallet, a pickpocket and a gun receipt.

Harry (Jack Warden) and his friend Chick Parrish (Pat Harrington) report a murder they witnessed during a helicopter flight over San Francisco. Harry and Chick, the helicopter pilot, insist they witnessed a murder, until the reported victim makes a personal appearance.