McGee is convinced department investigators aren’t sufficiently connected to the city’s lowlifes to get a handle on who’s behind the blaze—so he takes the case to Spenser. Spenser quickly learns not only that McGee might be right, but that the fire might be linked to a rash of new arsons, spreading through the city, burning faster and hotter every night. Spenser follows the trail of fires to Boston’s underworld, bringing him, his trusted ally Hawk, and his apprentice Sixkill toe-to-toe with a dangerous new enemy who wants Spenser dead, and doesn’t play by the city’s old rules. Spenser has to find the firebug before he kills again – and stay alive himself.