Magnum, P.I. (1980): Season 5, Episode 10

5 - 10: Luther Gillis: File #001

Robin and Higgins simultaneously ask Magnum to do some investigative work, so Thomas calls on St. Louis-based gumshoe Luther H. Gillis to nail the man who's blackmailing Higgins, while Thomas goes undercover to investigate embezzlement in a bank owned by Robin's friend.