Juan Francisco Villa

Danger swirls around the squad as they investigate a suspect for rape and try to protect their key witness.

Voight (Jason Beghe) and the team discover a massacre, eight million in cash stolen and two wounded men in a clearing house. During questioning, one guy, Perko (guest star Dusan Faeger), provides some intel that is key to the case and leads Antonio (Jon Seda) to realize that two gangs were involved. Burgess (Marina Squerciati) steps up to help the unit and prove herself to Voight. Meanwhile, a softer light is cast on Platt (guest star Amy Morton) when she enlists the help of Ruzek (Patrick Flueger).

Erin's case against cartel member Carlos Munoz intersects with a husband-and-wife domestic abuse call that Jamie handled, but when the wife is murdered all hands are on deck, the husband becomes the prime suspect.

While Elizabeth is in Libya to help negotiate an end to their civil war, a tragic accident with her chauffeured car embroils her in an urgent situation to secure medical care for a gravely wounded local girl.

Jack and Elaine work to navigate the situation with their kids; Sara and Drew threaten to fall back into bad habits; Jack and Drew decide to work together.