When the team finds the body of a widowed, single-mother in the trunk of her car, they are shocked to discover that the victim was in constant contact with Voight's now-reformed son, Justin. After Lindsay and Voight find Justin has been attacked in the same manor and is critically injured, Antonio and the team know that Voight will be out for revenge. Meanwhile, Roman makes a difficult decision and Commander Crowley has plans to make changes within the unit.