While trying to help out Olive Voight is attacked and taken. When he doesn't show for work the team gets suspicious and begin investigating. Ruzek and Atwater prove they do belong on the team when they demonstrate smarts and savvy tracking down a lead that will hopefully bring them to Voight. Meanwhile Burgess and Roman are trying to track down a girl who has run off with a police badge.

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 and Det. Amaro along with Halstead and Antonio continue to hunt for the link to foster care and child trafficking. Meanwhile Burgess and Roman try to find the shooter from the hospital after using surveillance footage to identify him. Platt shows her deep respect for police and the dangerous work they do by honoring their fallen brother.