When a neurosurgeon is assassinated just before performing surgery, Five-0 uncovers the shocking truth behind the disappearance of four reform school boys 40 years ago. Also, McGarrett's Mercury Marquis is stolen by an unlikely culprit. Daniel Baldwin returns as Paul Delano.
While Five-0 investigates a scuba diver's death from a gun recently used in another murder, McGarrett prepares to propose to Catherine. Andrew Lawrence and Michelle Borth return.
Five-0 goes back to school when a college professor is killed and Danny goes undercover as his replacement.
McGarrett and Danny recruit Tani Rey (Meaghan Rath) to join the task force when diabolical hacker Aaron Wright (Joey Lawrence) releases a dangerous arsonist from prison. Rosalind Chao guest stars as Governor Keiko Mahoe. Joey Lawrence guest stars.
In order to stop a meth epidemic on the Island, McGarrett and Danny go undercover as pilots, but when McGarrett is seriously wounded, Danny is forced to break their cover in order to save his partner's life.
