Macy, Jordan, Woody and the rest of the crew are rocked by emotional and physical trauma when a commuter train carrying schoolchildren and their pregnant teacher is destroyed in a terrorist attack.

A case literally hits home for Jordan when one of her upstairs neighbors is murdered and his young daughter becomes the target of an assassin. Meanwhile, Macy struggles to deal with a prominent family whose son was in a drunken-driving accident with an unfamiliar woman.