Magnum, P.I. (1980): Season 4, Episode 16

4 - 16: The Return of Luther Gillis

St. Louis gumshoe Luther H. Gillis returns to Hawaii, accompanied by his secretary Blanche, to attend the annual Private Investigators convention, where Luther has been informed he will receive an award. But while Luther and Magnum attend the convention, Higgins and Blanche are kidnapped from the Estate, and the two P.I.'s find themselves having to join forces once again.