A woman loses her fourth son to gang violence, and Lilly determines to stop the cycle and save her remaining child by convicting gang leader Miguel Maldonado.
Xander falls for a beautiful substitute teacher who is actually a She-Mantis intent on mating with, then decapitating, virginal boys.
McGarrett works the murder case of one of the last survivors of the USS Arizona; Adam uncovers bone fragments at his new construction job.
The mother (Edith Atwater) of a rookie policeman killed in an auto mishap refuses to believe his death was accidental.
Chloe takes June drinking in the financial district, where she finds a hot broker and a job offer; James is paired with the worst dancer on "Dancing With the Stars."