The D-day landings--the fate of 2.5 million men, three thousand landing craft and the entire future of Europe depend on the right weather conditions on the English Channel on a single day. A team of Allied scientists is charged with agreeing on an accurate forecast five days in advance. But is it even possible to predict the weather so far ahead? Wallace Ryman has devised a system that comprehends all of this--but he is a reclusive pacifist who stubbornly refuses to divulge his secrets. Henry Meadows, a young math prodigy, is sent to Scotland to uncover Ryman's system and apply it to the Normandy landings. But turbulence proves more elusive than anyone could have imagined. When Henry meets Gill, Ryman's beautiful wife, events, like the weather, begin to spiral out of control.--From publisher description.