Benjamin Twist, a teacher working during school holidays as a ship's porter ends up on a ship bound for America and impersonating a professor, Phineas Tavistock. Along with American gangster and stowaway Bugs Leary (Edgar Kennedy), Twist finds himself entangled in a plot to kidnap the son of a millionaire whom 'Professor' Tavistock is teaching. Things are further complicated by the fact that two sets of gangsters are attempting to get their hands on the ransom money, which Twist is given to hand over.