1916, Bois de Bolante, France. The battles in the trenches are raging fiercer than ever. In a deserted mineshaft, French sappeurs discover an unconscious man, and nickname him The Mole. Claiming he has lost his memory, The Mole is convinced that he's dead, and that an Other has taken his place. The military brass considers him a deserter, but front physician and psychiatrist-in-training Michel Denis suspects that his patient's odd behavior...