• "A cracker . . . Utterly convincing"

    Philip Pullman
  • "WW2, somewhere in southern England. Our mathematically and psychically gifted soldier-narrator is on a secret mission . . . Despite the diversity of its elements, this is a well-paced, enjoyable read, which effectively combines ideas generally not seen together in WW2 fiction, and certainly not children's fiction"

  • "The real-life location, historical detail and plausible contemporary voices give this conviction"

    Sunday Times