Barney takes the gang to a strip club, where they see Jasmine, Lily's stripper doppelganger, and end up having a crazy night at an underground poker game.
The team investigate several cases of brutal acid attacks after multiple young men and women are disfigured. Meanwhile, Dr Reid familiarises himself with his new surroundings.
Abby Sciuto joins the team when it appears that there is a link between the murder of an engineer in LA and the activity of a serial killer she has been investigating in DC.
Max and Caroline risk ruining their reputation, when they attempt to interfere with a basketball game and promote their cupcake business.
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.