When the victim's father is ruled out as a suspect in a kidnapping case, the unit investigates the seemingly safe neighbourhood in which the child lives for clues as to who is responsible for the young girl's abduction.
The team deal with a case of déjá-vu when survivors of a high school massacre are targeted by a new murderer with a similar killing style.
McGarrett's first date with Lynn turns deadly when they are targeted by a mob boss. Elsewhere, Chin and co race to prevent a murder.
The team reopens the 1980 case of a hockey player who was killed at his team's ice rink in Philadelphia the day the U.S. hockey team beat the Soviet team at the Winter Olympics.
Having been recruited by the people who `burned' him, Michael's new handler Carla tasks him with helping computer tech Jimmy, whose wife and daughter have been kidnapped, liberate some information that is guarded by mercenaries.