Lydia Carlton is a fairy doctor, one of the few people with the ability to see the magical creatures who share our world. During one of her rare trips to London to visit her father, Lydia's quiet life is suddenly transformed when she is rescued from kidnappers by a mysterious young man!

Lydia and Edgar have returned to London after their adventure on the Isle of Manan. But life in the capital is no respite for the weary travelers. A being called the Fogman stalks the night streets, snatching children all around town. And it may have something to do with Edgar's dark past...