Moving north to wintry Maine, King and Slater get three days of rest before they’re barrelling straight back to Boston with their hearts in their throats. Something they left behind has blown up in their faces, and suddenly they’re vulnerable, exposed. It’s all different now; the game has changed. In the shocking aftermath, it’s on them to pick up the pieces, and before long it dawns on them that they’ll need to make a choice. They’re caught between a rock and a hard place. To keep their families safe, they’ll need to do the unthinkable; what they swore they’d never do…