At his mentor's request, McGarrett persuades Max to redo the autopsy on a SEAL, thought to have committed suicide, in order to investigate his murder. Meanwhile, Chin Ho worries about Kono hanging out with a group of dirty ex-cops, including Frank Delano.

Chin Ho is kidnapped and wakes to find himself trapped in Halawa prison disguised as an inmate. With no time to waste, the team must bypass the rules to save Chon Ho’s life.