NEW YORK TIMES BESTSELLER - A "riveting"* international cloak-and-dagger epic, here is the stunning untold story of Ernest Hemingway's dangerous secret life -- including his role as a Soviet agent code-named "Argo" -- that fueled his art and his undoing.

In 2010, while he was the historian at the esteemed CIA Museum, Nicholas Reynolds, a longtime American intelligence officer, former U.S. Marine colonel, and Oxford-trained historian, began to uncover clues suggesting Nobel Prize-winning novelist Ernest...