Shawn Thomsen

As serial killer Dr Madison Gray returns, McGarrett and Five-O find themselves sucked into her twisted mind games.

McGarrett lets himself be captured by the group he thinks is responsible for the killing of his CIA agent friend, and Tani questions whether she should tell McGarrett about the murder weapon she found at Adam's house.

When following McGarrett and Wo Fat's escape, gunmen hit Five-0 headquarters. McGarrett must turn on his own in order to find Catherine.

When a man from Detroit is killed on the streets of Oahu, the team is shocked to discover the killer's motives. Also, Chin risks everything to help Danny.

When a tourist unknowingly transporting a stolen Van Gogh is murdered, Kono and Chin go undercover into the world of black market art. Meanwhile, McGarrett asks chef Masaharu Morimoto to train Kamekona for a shrimp cook-off.

While O'ahu finds itself going on lockdown as the team looks for a terrorist who is using weaponised drones on civilians, McGarrett and Danno attend a review with a psychologist.