"The Catcher Was a Spy" by Nicholas Dawidoff is a biography of Moe Berg, a former Major League Baseball player who also worked as a spy for the United States during World War II. The book explores Berg's unusual life and career, from his early years as a gifted athlete to his time as a spy in Europe during the war. Dawidoff draws on extensive research and interviews with Berg's friends and colleagues to provide a detailed and fascinating portrait of this complex and enigmatic figure. Along the way, the book offers insights into the world of espionage and the challenges and dangers faced by those who worked as spies during one of the most tumultuous periods in modern history.