Anna Lawrence has always had the power to 'see' the true nature of people, an ability which has frightened others and led to her persecution. However, aged fourteen, Anna discovers three things which will change her life forever: that there are others who share her ability; that evil exists in this world in a form far purer than she could ever have imagined; and that she is in love.

Agents of darkness beyond comprehension are abroad in the world and London lies gripped by fear as a demonic beast stalks the night. Anna learns the nature of absolute evil – evil which it is her fate to stand against.