The cops wrestle with an unthinkable crime when a family is murdered in their sleep.
Teenager Sam Conway shows evidence of rape but refuses to name his attacker. Meanwhile, Benson and Rollins confess to some major life changes.
In the conclusion to the season premiere, ADA Stone blames himself for the shocking verdict in Sam's case, and before Benson can offer help, Sam makes a tragic decision.
Benson tries to help two teen aged sisters after their father is killed. Meanwhile, Rollins goes into labour.
When an innocent man is brutally attacked and beaten to death by what looks like a monster in a black cape, the CSIs are called to investigate, only to learn that a similar attack took place minutes later.