"First published in Australia by Puffin Books, an imprint of Penguin Random House Australia Pty Ltd., 2020"--Colophon.

"When Oliver finds a lost library book fluttering behind a secret door in his bedroom, he knows he must return it. But when he does, a mysterious world opens up beneath his feet, taking Oliver, his new friend Rosie, and the book in tow. What--or who--will they find waiting in this strange new place? And how will they escape?"--