Through a Diamond chronicles the 100-year history of baseball in America and the role
it played in fostering relationships between the U.S. and Japan. Author Kerry Yo Nakagawa also describes how the game of baseball remained in the lives of Japanese Americans who, even after being incarcerated in American concentration camps during World War II, were able to organize themselves into leagues and travel from state to state to compete on the baseball diamond.

Nakagawa is the project director for the non-profit Nisei Baseball Research Project (NBRP), curator of the Diamonds in the Rough: Japanese Americans in Baseball exhibition which was displayed at the National Museum in the summer of 2000, a consultant to the prestigious Baseball Hall of Fame tour entitled Baseball in America, and an independent producer/filmmaker, actor, researcher, and writer.