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.
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.
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.
Five-0 goes back to school when a college professor is killed and Danny goes undercover as his replacement.
McGarrett enlists Joe's help after Danny and Chin are arrested for deadly past transgressions. Terry O'Quinn and Jimmy Buffett return.
