John Ellis, a disillusioned suburban ER doctor, who finds his existence transformed when he intervenes in a drive-by shooting, saving a young boy's life and killing one of his attackers. When he learns the boy is still marked for death he finds himself compelled to save him at any cost and discovers that his life and his outlook on medicine may never be the same.
Season Finale - John and Gretchen try to take Antoine home, but an unexpected complication forces John to do everything he can to save the youth—and his own family.
Holden forces John to testify against the Latin gang; and Samantha's past threatens her marriage.
John tries to rein in his compulsions, but is tested when he's tipped off about an impending massacre. Samantha turns to Det. Holden for answers.
John wants to help Gretchen, but doesn't want to circumvent the law. Samantha's doubts about John are increased by information provided to her by Kyle.
Det. Holden of the Gang Task Force questions John about his suspicious activity. Gretchen travels to the gang neighborhood to save a young boy.
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. Gretchen tends to the young woman who sparked the bloodshed.
Gretchen makes expensive arrangements to hide Antoine in order to prevent Bridget from learning that John illegally transferred him to the surgical center. However, that means John needs to ask the gang for money. A past indiscretion tests John's relationship with Samantha.
John visits Antoine's father, the leader of the VCC gang, in prison, and tries to disentangle himself from his responsibilities with Antoine. Things get out of control when Gretchen confronts Hillary's abusive boyfriend at his home.
Disillusioned ER doctor, John Ellison saves the life of a young boy when he intervenes in a drive-by shooting and ends up in the middle of a gang war.