100. Canada’s Bletchley Park: The Examination Unit in Ottawa’s Sandy Hill 1941–1945 (Revised Edition)

When WW II broke out in 1939, the Canadian government had no foreign intelligence capacity of its own. Kept secret for many decades, this story reveals how a top secret code-breaking unit was set up in a Victorian mansion in Ottawa and identifies all those who worked there. By Diana Pepall.

The revised edition is substantially different than the original edition. January 2017 (ISBN 978-0-920960-43-1). Revised edition April 2023 (ISBN 978-1-998054-00-8).