Dawson is trying to talk a woman off a ledge. He succeeds by promising to go after her boyfriend. He brings the case to Intelligence. 

Lindsay is partying it up at a club and ignoring calls from Halstead. 

Voight interrogates the woman's boyfriend, Benji, and tells him if he serves up Derek Keys, he'll let him walk, 

Halstead confronts Lindsay and tells her that Voight put her on a three week furlough in case she changed her mind and it ends tomorrow. She is not interested. 

Olinsky confides in Platt that he has a daughter and that her mom is about to go to jail for embezzlement. Platt offers to help him. 

Platt gives Burgess her out of date wedding planner from when she was engaged. 

Ruzek asks Atwater to be his best man. 

Benji sets up a meet for Halstead as a potential buyer with Derek. Benji is killed and Halstead is abducted. 

A kid delivers a CD to Voight of Halstead being tortured. Derek tells him that he wants all of their CI files in exchange for Halstead and to send a lone female to deliver them. Voight instructs the team to create false files. 

Olinsky tells Lindsay that Halstead has been kidnapped. 

Lindsay arrives to volunteer to deliver the files. Voight reluctantly agrees. 

They won't release Halstead until the files are verified. They discover the files are fake. 

They're about to kill Lindsay and Halstead, but Lindsay stabs her attacker and shoots Derek, saving them. 

Olinksy gets his daughter out of Juvenile Detention. 

Lindsay asks to come back to Intelligence, but Voight has conditions. 

Burgess finds a needle in Roman's bag.