McGarrett and a little girl are taken hostage by an armed man (Tom Arnold) during a camping trip with Grace; Kono meets Adam's brother, who was recently released from prison.
The team races to save an abducted college student from a dangerous vigilante; Max, Kamekona and Flippa struggle to survive after being shipwrecked.
Magnum's ex shows up at his home with a gunshot wound, wanting his help.