Hilketa is a violent pastime where players attack opponents with swords and hammers and score by carrying their heads through goalposts. The players are robot-like "threeps" controlled by people with Haden's Syndrome. No one gets hurt, but the brutality is real and the crowds love it. Until a star athlete drops dead on the field. Accident, or murder? FBI agents and Haden-related crime investigators Chris Shane and Leslie Vann investigate.