"Bletchley Park : The Secret Archives" by Sinclair McKay and Bletchley Park is a comprehensive history book published in 2016 by Quarto Publishing Group UK. This hardcover book delves into the secrets of Bletchley Park, a top-secret military intelligence centre during World War II. With a focus on military history and the 20th century, this book offers insights into the crucial role of Bletchley Park in the war effort. The illustrations and 176 pages of content provide a vivid and detailed account of one of the most significant periods in British history.