I, too, read this book in one sitting, staying awake into the early hours of the morning to finish it. The story itself is disturbing enough but Frayn writes with a certain chilling detachment, transforming what might have read as a tragic tale of one woman's unimaginable grief into an extremely spare and taut thriller. This book is really about self -deception more than deception and Frayn's use of a flawed narrator pursuing his own agenda only adds to the tension. I defy any parent to find this anything but deeply affecting and all other readers will be enjoyably gripped.