Birdie McAdam, a ten-year-old orphan, is tougher than she looks. She's proud of her job as apprentice to Alfred the Bogler, a man who catches monsters for a living. Birdie lures the bogles out of their lairs with her sweet songs, and Alfred kills them before they kill her. On the mean streets of Victorian England, hunting bogles is actually less dangerous work than mudlarking for scraps along the vile river Thames. (See glossary!) Or so it seems—until the orphans of London start to disappear . . .

    But everything changed when Dr. Walker lost his job in the wake of a mysterious incident. Now in dire straits, the family must relocate to an old Victorian house that used to be the home of occult novelist Denver Kristoff—a house that feels simultaneously creepy and too good to be true.By the time the Walkers realize that one of their neighbors has sinister plans for them, they're banished to a primeval forest way off the grid. Their parents? Gone. Their friends? A world away. And they aren't alone. Bloodthirsty medieval warriors patrol the woods around them, supernatural pirates roam the neighboring seas, and a power-hungry queen rules the land. To survive, the siblings will have to be braver than they ever thought possible—and fight against their darkest impulses. The key may lie in their own connection to the secret Kristoff legacy. But as they unravel that legacy, they'll discover it's not just their family that's in danger . . . it's the entire world.