Toby Daye, half fae and half human, is the only changeling who has ever earned knighthood in the Faerie world. Her current mission: to visit the County of Tamed Lightning (Fremont, California) and check on Countess January O'Leary, who has been out of contact. This simple assignment becomes deadly when people close to January start turning up dead, and it's up to Toby to find and stop the killer.