1940s San Francisco: Private Investigator Thomas S. Magnum investigates the murder of newspaper tycoon William T. Maxfield. The case involves characters who also bear strong resemblances to the "modern day" T.C., Higgins and Rick.
- 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