The Catcher was a Spy

The Mysterious Life of Moe Berg
Nicholas Dawidoff - 1995 Knopf Doubleday Publishing Group

There isn't much to write about this well researched book because it's not really a sports book. 

Brief mention is made of Berg's athletic career but most of the book focuses on his eccentric personality and life style.   By the end of the book I was more frustrated with Berg's wasted potential than fascinated by his "secret" life.