After a 16-year-old kidnap victim escapes her captors, her parents hire Magnum, who experienced similar trauma as a POW, to find who took her.
Kono must fight for her life after discovering a notorious criminal's identity; Adam's ties to his formerly corrupt family business leaves Kono feeling concerned.
Harry Langford enlists McGarrett and Danny's help to track down a teenage British royal who has run away while under his protection; Grover, Tani and Junior work a 25-year-old murder case after a mysterious videotape arrives at headquarters.