A series of mysterious and brutal murders deep inside the dark forest shatters the peaceful tranquility of the Hawkenlye Abbey. The sheriff of Tonbridge hastily blames the mythical Forest People and plans to execute the first available suspect. But when two young nuns begin wandering mysteriously into the forest at night and disappear, Abbess Helewise soon discovers a mystery that combines human treachery and otherworldly rituals. With the help of Sir Josse d'Acquin, a knight whose loyalty is matched only by his fearlessness, the Abbess enters the heart of the forest in search of its murderous secrets - only to discover something even more terrifying...