Agatha Christie is about to board a train in London, when she feels a touch on her back, causing her to lose her balance, then a sense of someone pulling her to safety from the rush of the incoming train. So begins a terrifying sequence of events. Her rescuer is no guardian angel; rather, he is a blackmailer and Agatha must use every ounce of her cleverness to thwart an adversary determined to exploit her genius for murder to kill on his behalf. A must for all Christie fans.