Robin Masters asks Magnum to track down an embezzler working in a local bank. Meanwhile, Higgins is being blackmailed and since Magnum is busy, he recruits Luther Gillis to help him find the blackmailer.
- Tom Selleck as Thomas Sullivan Magnum IV
- John Hillerman as Jonathan Quayle Higgins III
- Roger E. Mosley as Theodore "T.C." Calvin
- Larry Manetti as Rick Wright