A gripping World War II thriller by Ken Follett. Set in Nazi-occupied Denmark in 1941, the novel follows Harald Olufsen, a courageous young Danish man who uncovers a secret German radar system capable of threatening Allied air operations. Determined to get this crucial information to Britain, Harald undertakes a dangerous journey across the North Sea in a small Hornet Moth aircraft. Packed with espionage, suspense, romance, and adventure, the novel vividly portrays the bravery of ordinary people during wartime.