Harry Fabian (Richard Widmark) is a cheap con-artist in London looking for a big score to lead him to the good life, but who never seems to hit the right combination to do so. But when he meets up with retired wrestling superstar Gregorius (Stanislaus Zbyszko), he concocts a scheme to take over the professional wrestling business through the man's son, promoter and underworld boss Kristo (Herbert Lom).