"Grey is just a puppy when he arrives at the War Dog Training school. Nathan, his trainer, is a brave young soldier. Wolf is a war dog who's seen it all. Grey and Nathan soon become inseparable. Until the day a parachute jump goes tragically wrong...As the Second World War rages, Grey faces his most important mission yet: to find his best friend. With Wolf at his side, he must journey across France and behind enemy lines. His path is fraught with danger. Can he reach Nathan before it's too late?"--Back cover.