This was a new author for me and, as I was looking for a good mystery, I was surprised to find myself not only immersed in the mystery at hand that takes place years later, but also in the memories and flashbacks to the Viet Nam War...all based on fact - the My Lai Massacre. The author was there as a soldier shortly after that terrible annihilation of innocents. He knows what our men went through, psychologically, and what drove them to commit such awful carnage, all without dismissing their and their superiors' guilt. A powerful message of the long-lasting effects on such young, unformed men, pushed to their limits, haunted throughout their lives by the orders prescribed to them by war. Powerful and engaging. I will be reading more of Tim O'Brien's work.