Investigators have unearthed a gruesome mass grave along the beaches of Kamakura, Japan. The grave is filled with thousands of skeletons that date back to 1333 a time when the people there incurred the wrath of the emperor and fought in a series of bloody battles. With new forensic examination, Warrior Graveyard examines the remains of six people killed at the beaches of Kamakura to gain insight into the secrets of the samurai.