This is a book about an unsung hero, Frederick Zinn of Galesburg, MI. He was a First World War veteran of the U.S. Army Air Service (as well as former French Foreign Legionnaire and member of the French Aéronautique Militaire) and the efforts he made to find and identify missing American airmen from both World Wars. The book offers some interesting stories about several of these airmen, mainly from the First World War.
I've been fascinated with First World War aviation since I was 12. So, this particular book fit the bill for me. HIGHLY RECOMMENDED.