NBC ’s government-employee dramas Chicago Fire, Chicago P.D. and Law & Order: SVU are set get down and dirty with each other in a three-episode, three-part, three-show crossover the likes of which we’ve seen a few times before. The story will focus on a child pornography ring that spans both New York City and Chicago, prompting our heroes to join forces—and quickly deflating any additional sex jokes about the crossover.