From the prize-winning author of "The Last King Of Scotland", blending fact and fiction. The D-Day landings depend on accurate weather predictions, but can the weather be predicted so far in advance? Only one man, Wallace Ryman, has developed a system, but he is a pacifist and refuses to divulge the secret. Mark Latchford is sent to Scotland to try and find out the secret in time for the Normandy landings, but events - and the weather - begin to spiral out of control. For fans of "Enigma" and "Charlotte Gray".