Alexis DeLaRosa

McGarrett and the gang investigate the murder of a bounty hunter who had just apprehended a dangerous killer; Danny is left reeling when his wife reveals a shocking secret that will change his life forever.

Witnessed by a packed subway carriage, the killing of an old man by a single bullet looks like an open-and-shut case, until it is discovered that the victim was not an old man and the weapon was not a gun.

During a competition with street racer Carmen Lopez, a man is killed by a driverless car when it is hijacked by a hacker.

When a police dog finds heroin in a young girl's backpack, Milt and Russ have different theories on where it came from. Jacocks goes to Detroit for a training seminar, and hopes to determine why Milt came to Battle Creek.

Rosewood and Villa become closer as they follow a trail left for them by a serial killer.

Lydia is suspended from duty and bonds with an injured witness; Chickie is haunted by a high-speed chase; John tries to clean up a neighbourhood.