Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Adventure, true, amazing, inspiring, WW II British agent

Here's a book like Krakauer's "Into Thin Air", his "Into the Wild", and Lansing's "Endurance: Shackelton's Incredible Voyage". It's the adventures of a young Austrian refugee who volunteered as a British agent and was dropped into France posing as a German agent and carrying false invasion plans just before D-Day, World War II. Partially because of his convincing performance, the Germans were ready for an invasion at Calais, with Normandy defenses left weak enough so Allied losses on June 6, 1944 were far less than expected. He knew he would be exposed shortly after that date-he was then supposed to escape. He did, but it wasn't easy. I was fascinated by this incredible but true story, the facts for which British writer James Leasor obtained about 1980 from previously secret sources. The expertly crafted book is now out of print, but amazon.com got it for me. Don't miss it, you'll love it.