Tensions are rising as a series of explosions in US cities have killed thousands and have the nation on the brink of disaster. With no clues to go on and with time running out until the next detonation is expected, Malcolm, Mary, and John have to find out who is behind the terror campaign and try to stop it. John Davis' new abilities are used to assist the efforts of APPUS, while powerful forces work to shut them down. It's a race to the final bomb and there's no time to spare.