A New York Times bestselling series A USA TODAY bestselling series A California Young Reader Medal-winning series A telepathic girl is the key to an unknown world and it's up to her to save it in books six through nine in the thrilling Keeper of the Lost Cities series--now available together in a collectible hardcover boxed set!

Sophie Foster is struggling. Grieving. Scrambling. But she knows one thing: she will not be defeated.

The Neverseen have had their victories--but the battle is far from over. It's time to change tactics. Make sacrifices. Reexamine everything. Maybe even time for Sophie to trust her enemies.

All paths lead to Nightfall--an ominous door to an even more ominous place--and Sophie and her friends strike a dangerous bargain to get there. Then, when Sophie doesn't know who to trust and the Neverseen proves how vulnerable she is, she decides to change the rules. When the dust settles, she feels a pull toward Stellarlune.

Unlocked Book 8.5 continues the story of Legacy and includes a comprehensive guide to the world of the Lost Cities.

This spectacular hardcover boxed set includes: Nightfall Flashback Legacy Unlocked Book 8.5 Stellarlune