The gritty drama centers around John Ellison (O'Mara), 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 Ellison learns the boy is the son of an influential gang leader and is still a target, he is compelled to save him at any cost. Ellison soon discovers that his own life - and his outlook on medicine - may never be the same.