When a man is found castrated and left for dead, Rollins and Carisi uncover three female suspects with possible motives. Meanwhile, Langan brings devastating news for Benson.
Investigating the fatal shooting of a college student 25 years earlier, the team suspects several former coeds who accused him of date rape.
McGarrett and Kono suspect that an abused young girl may be the victim of a sex trafficking ring on the Island; Chin and Grover investigate a murder at a sober living facility.
J.D. and Elliot must deal with a lousy bunch of interns; Carla forces Elliot to acknowledge the feelings of her suffering ex-fiance Keith; the new Chief of Medicine takes the Janitor to task for his tomfoolery.
The doctors and surgeons at Sacred Heart are suddenly burdened by the obtrusive approach to management by Dr. Maddox.