When a dangerous military experiment on England's Salisbury Plain goes fatally awry, the authorities hastily and secretly bury the bodies of a dozen soldiers and a few other victims. The body of one soldier, Steven, is supposedly returned to his parents, but the coffin is empty. Ten years later, Steven's still grieving father, Tom, locates the place of burial. But when Tom excavates the site, he discovers not his son's remains but the moldering corpse of a little girl animated by a peculiar form of life.