Chicago P.D. - Season 3 (2015)

Voight and Olinsky hunt down a criminal they once put away.

When an undercover job goes south, Ruzek is investigated by a street deputy who will determine his future with the unit.

"You Never Know Who's Who" The discovery of a body leads to a cache of weapons, which then leads Intelligence on a strange investigation into a team of "operatives" that are targeting criminals within the city. Roman treats a sick young boy to a day at the 21st district.

Intelligence tries to find a missing teenage boy they believe could be a threat to the students at his wealthy school when they find disturbing drawings in his notebook.

The team discovers the mutilated body of a government official and learn that he had access to very important devices.

When a woman's decapitated body found in Lake Michigan is connected to Voight's social group, Lindsay worries that his relationship with the group could affect his ability to see the case objectively.

A doctor from Voight's past is under investigation when four of his patients are sent to Chicago Med for an overdose of chemotherapy.

The team investigates the robbery of a luxury condo and Voight suspects that the family was knocked out by a powerful gas.

Voight enlists his former cell mate to help take down a major cocaine supplier, while Burgess makes a move regarding her relationship with Ruzek and Roman comes up with a plan to fund Platt and Mouch's wedding.

Lindsay goes undercover to find a rogue police officer who targets women at a local casino.

SVU detectives Olivia Benson and Odafin Tutuola come to Chicago to help find escaped killer Greg Yates.

A college professor is caught smuggling heroin to Canada.

The police investigate a boy's execution-style murder, which may be connected to another shooting. The incident also leads officers and members of the community to gather for a candlelight vigil.

Halstead and his co-workers get caught up in a violent shootout with bank robbers while on his off-duty job at the dispensary.

The team investigates a kidnapping at a secret shelter for battered women.

The team looks for a suspect who held a woman for months, physically abusing her and psychologically attempting to manipulate her into forgetting her identity.

Intelligence searches for the culprit who left a newborn baby in a duffel bag.

Burgess goes to court for shooting a 17-year-old honor student she suspects shot Roman.

The team investigates a pyramid scheme operation that may be linked to a brutal murder at a family residence.

A murder investigation becomes personal for Voight when his son Justin is attacked in the same manner as a widowed, single mother whose body is found in the trunk of her car.