It is 10 November 1944 and a young woman in a woollen coat steps off a trolley bus into the darkness of wartime London and vanishes. Sixty years later, museum curator Harry Stammers receives an intriguing invitation from Bletchley Park veteran Elsie Sidthorpe. Aided by Ellen Carmichael, Stammers sets out to discover the truth about what happened to Martha Watts.THE SHELTER tells the stories of Harry Stammers, curator at the Britain's wartime code...