On the same day Jason King is set to become a father, Will Slater sees a 12-year-old boy on a street corner. There's nothing particularly alarming about the kid, but Slater has a sixth sense when someone needs help, so he steps in to protect. After his vicious deliverance of justice enrages half the Boston underworld, Slater meets the whirlwind of chaos head-on. He made the choice to get involved, so he won't stop until the war is won. As King gets swept up in the madness from the supposed safety of Violetta's hospital room, their battles intertwine. And as the bodies pile and the scum of society seep from the woodwork, Slater confronts hidden truths he'd never learned: This boy he's protecting, this stranger, starts to remind him that family isn't always blood.