In Olive's third adventure, what lurks below the house could be as dangerous as what's hidden inside . . .
Some terrifying things have happened to Olive in the old stone house, but none as scary as starting junior high. Or so she thinks. When she plummets through a hole in her backyard, though, she realizes two things that may change her mind: First, the wicked Annabelle McMartin is back. Second, there's a secret underground that unlocks not one...

The fifth and final book in The Books of Elsewhere, the award-winning, New York Times bestselling, fan-favorite series—absolutely not to be missed.
Annabelle McMartin is gone for good, but something worse lurks just out of sight—watching, waiting, preparing to strike. Then a field trip to the local art museum reveals a shock. What Olive discovers will create a chain of events that propel her to discoveries she may not wish to...

When eleven-year-old Olive and her distracted parents move into an old Victorian mansion, Olive finds herself ensnared in a dark plan involving some mysterious paintings, a trapped and angry nine-year-old boy, and three talking cats.