Denny Woods is blackmailing Ruzek and forcing him to frame Voight. Will he go through with it?

Halstead is an exceptionally good undercover cop but he got too emotionally invested in this case.

Voight was celebrating a victory by saving a kidnapped child but Ruzek's celebration was cut short when he had to frame his friends.

Halstead uses his previous military training to go undercover and stop a child kidnapping ring.