As the second season begins, Wo Fat orders Hesse to kill McGarrett behind bars and kills Hesse to prevent Five-0 from getting more answers about him. He is also in cahoots with ex–CIA analyst Jenna Kaye, whose fiancé was captured in an earlier mission to take down Wo Fat. This allows him to manipulate Kaye in getting Steve's help for a fake ransom exchange in North Korea. He kills her and disappears as Five-0 rescues Steve. It is revealed that Wo Fat is obsessed with finding and killing a person named "Shelburne", who apparently killed his father years before the series. As Wo Fat hides in Osaka, late in the season, McGarrett captures him and brings him back to Hawaii. However, both men are forced to work together in fighting off Hiro's son and successor Adam, who was seeking revenge for his father's death. McGarrett locks him up at the Halawa Correctional Facility at the end of the season.