Tonight on CBS their reboot of the classic series Magnum P.I. airs with an all-new Friday, March 5, 2021, episode and we have your Magnum P.I. recap below. On tonight’s Magnum P.I. season 3 episode 10 “The Long Way Home,” as per the CBS synopsis, “When an Army ranger goes missing after returning from deployment, Magnum learns of the traumatic news he received upon arriving home and must find him before survivor’s guilt consumes him. Also, Higgins and Ethan solve the case of a missing engagement ring while on a mini-break, and Katsumoto tries spending quality time with his teenage son.”