Magnum P.I.

CBS | 9:00 pm

This detective show reboot wraps up its third season with "Bloodline," with Magnum and Higgins (Jay Hernandez, Perdita Weeks) taking on a stalking case involving a girl and a man with experience in espionage. On a more personal note, Ethan (guest star Jay Ali) invites Higgins to join him on a trip for Doctors Without Borders, just as Magnum has started to warm up to other possibilities with his partner. Zachary Knighton and Stephen Hill also star. CBS recently greenlit Season 4 of this series.