SVU DETECTIVES TRAVEL TO CHICAGO TO HELP INTELLIGENCE TAKE DOWN A PEDOPHILIA RING AT ITS SOURCE. The final part of the crossover event finds our intelligence unit joined by detectives from New York’s special victims unit to help solve the pedophile ring case. Ruzek (Patrick Flueger) and Det. Amaro (guest star Danny Pino) along with Halstead (Jesse Lee Soffer) and Antonio (Jon Seda) continue to hunt for the link to foster care and child trafficking. Meanwhile Burgess (Marina Squerciati) and Roman (Brian Geraghty) try to find the shooter from the hospital after using surveillance footage to identify him. Platt (Amy Morton) shows her deep respect for police and the dangerous work they do by honoring their fallen brother. Jason Beghe, Sophia Bush, Elias Koteas and LaRoyce Hawkins also star. Guest starring Charlie Barnett, Kara Killmer, Kelli Giddish, Markie Post and Mariska Hargitay.