Plot summary
Detective Lassiter is leading a Civil War reenactment when he discovers one of the actors dead. Although evidence points to an accident, he and Shawn and Gus believe it was murder. While Shawn and Gus visit their prime suspect, a dentist and former friend, Lassiter interrupts and arrests the man. They realize that the man could not have been the killer, and join the regiment in order to find out more. They visit a Civil War memorabilia collector, who tells them about his involvement in the reenactment. While in a practice run, Shawn realizes who the real killer was, and reveals it shortly after the actual reenactment.
Credits
Adapted from Wikipedia contributors, Psych season 1. HTML formatting and reference markers removed.