At 10:00 p.m. April 13, 1956, attorney Thomas Costello boarded a train at New York’s Pennsylvania Station en route to Yemassee, South Carolina-the first leg of his voyage to the United States Marine Corps’ training depot on Parris Island to defend his brother-in-law, Staff Sergeant Matthew McKeon.

Five days earlier, McKeon had led a training exercise that went tragically wrong, resulting in the drowning deaths of six recruits. McKeon was immediately arrested, and, less than twenty-four hours later, Marine Commandant Pate made a press statement that essentially accused the young man of manslaughter before a court of inquiry even convened.

McKeon’s case would change US Marine training practices forever-that part of his story is well known. But Counsel for the Accused Marine Corps Drill Instructor tells a different tale.

This is the story of Thomas Costello, defending his brother-in-law at the request of his wife. It’s the story of a legal team that worked tirelessly for six months in McKeon’s defense. And it’s the tale of the volunteer counselor who strategized and executed one of the most brilliant criminal defenses in American history: Emile Zola Berman.