The Shadows (The Books of Elsewhere, Volume One)

The first entry in the New York Times–bestselling series.

Old Ms. McMartin is definitely dead, and her crumbling Victorian mansion lies vacant. When eleven-year-old Olive and her dippy mathematician parents move in, Olive is right to think there's something odd about the place - not least the strange antique paintings hanging on its walls. But when she finds a pair of old glasses in a dusty drawer, Olive discovers the most peculiar thing yet: she can travel inside these paintings to Elsewhere, a place that's strangely quiet...and eerily familiar. Olive soon finds herself ensnared in a plan darker and more dangerous than she could have imagined, confronting a power that wants to be rid of her by any means necessary. It's up to her to save the house from the shadows, before the lights go out for good.