Stephanie Lum

Five-0 investigates when a bomb squad is attacked and the culprit threatens to detonate additional hidden explosive devices unless arsonist Jason Sinclair is released from prison. Also, after Adam returns from the hospital, Kono realizes that they are being watched, and McGarrett prepares to take his relationship with Catharine to the next level. Former UFC Champion Randy Couture returns.

A guilt-ridden Magnum follows the clues his private investigator friend, Harry Brown (guest star William Forsythe), left behind when he was shot while working a case Thomas passed onto him. Also, TC helps Kumu lead a protest against construction on a Hawaiian sacred site.

An armed hit team lays siege on Robin's Nest. TC is badly injured while Rick fights for his life.