Complications

Infection

Ellison scrambles to locate Antoine when the boy disappears from his bed at the surgical center; and Polk tries to convince a patient to lie about her medical condition in order to keep John out of their supervisors' crosshairs.

Onset

John visits Antoine's father, the leader of the VCC gang, in prison, and tries to disentangle himself from his responsibilities with Antoine. Meanwhile, things get out of control when Gretchen confronts Hillary's abusive boyfriend at his home.

Immune Response

Gretchen makes expensive arrangements to hide Antoine in order to prevent Bridget from learning that John illegally transferred him to the surgical center. That means John needs to ask the gang for money, however. In other events, a past indiscretion tests John's relationship with Samantha.

Outbreak

A gang shootout results in a flood of victims in the ER. John tries to halt the escalating violence, but to succeed he must navigate rival gang members and the police. Meanwhile, Gretchen tends to the young woman who sparked the bloodshed.

Diagnosis

Det. Holden of the Gang Task Force questions John about his suspicious activity; and Gretchen travels to the gang neighborhood to save a young boy.