[2] Two private detectives, Jim Packard (Jim Bannon) and Doc Long (Barton Yarborough), make the uneasy acquaintance of Jefferson Monk (George Macready) at a nightclub.

Upon learning their profession, Monk hires the two for protection, particularly from a hideous, peg-legged horror who stalks the streets, toting a valise, supposedly to use in transporting Monk's severed head to an ancient secret society.

When Packard and Doc trail Monk and a woman companion outside the nightclub, the one-legged man appears, but he eludes capture.

He has learned Monk's two-million dollar inheritance will go to charity instead of to his wife Ellen should he divorce her (Nina Foch).

In the end, Packard discovers Monk has begun killing off his wife's fellow conspirators, one by one, including the one-legged stalker.