Richard Breitman & Walter Laqueur 
Breaking the Silence [EPUB ebook] 
The German Who Exposed the Final Solution.

Through unparalleled historical detective work, noted scholars Walter Laqueur and Richard Breitman reveal the inspiring tale of Eduard Schulte, the Breslau business leader who risked his life to gather information about such Nazi activities as the revised date of the German attack on Poland and the Nazi plan for mass extermination of European Jews. First published in 1986, Breaking the Silence is reissued with both a new foreword and afterword by the authors.