The powerful CEO of a private military contractor is confronted by protesters and later found drugged and sexually assaulted in a park. Detectives Benson (Mariska Hargitay) and Amaro (Danny Pino) begin their investigation but find the victim unwilling to cooperate. As the SVU squad and Executive ADA David Haden (guest star Harry Connick Jr.) explore the motives behind the attack, a much larger crime and conspiracy in Iraq is unveiled. Also starring Ice-T (Detective Odafin Tutuola), Dann Florek (Captain Donald Cragen) and Kelli Giddish (Detective Amanda Rollins.) Laura Benanti (Maria Grazie) also guest stars.
Danny arrives at a college campus to find a murdered student, who was thought to be dealing drugs. Meanwhile, Jamie has a life crisis when he reconnects with a former law school classmate and Erin must learn to give Nicky some freedom.
When a knife-wielding attacker dressed as Baron Samedi, the Spirit of Death, stabs a man in costume on Halloween, Danny enters the world of voodoo. Meanwhile, DCPI Garrett opens up to Frank about a dark secret, and Erin and Nicky take Jack and Sean trick-or-treating.
When Danny and Kate come up empty-handed with leads for a shooting, Linda helps make a break in the case when she overhears the victim telling his priest who is responsible. Meanwhile, Henry is mugged at an ATM, which sends Jamie into a rage as he tries to track down the assailant. Chazz Palminteri and John Ventimiglia guest star.
When two motorists driving gas-guzzling cars die at the hands of a sniper, Danny and Kate are put on the case of what the city believes is the work of a radical environmental serial killer. Meanwhile, a bicycle accident sends Danny's son Sean to the hospital with a life-threatening injury.
