# Keeper of the Lost Cities Collection Books 6-9 (Boxed Set): Nightfall; Flashback; Legacy; Unlocked Book 8.5; Stellarlune - Hardcover

by **Shannon Messenger** (Author)

**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_

### Author Biography

Shannon Messenger graduated from the USC School of Cinematic Arts, where she learned--among other things--that she liked watching movies much better than making them. She's studied art, screenwriting, and film production, but she realized her real passion was writing stories for children. She's the _New York Times_ and _USA TODAY_ bestselling author of the award-winning middle grade series, Keeper of the Lost Cities, as well as the Sky Fall series for young adults. Her books have been featured on multiple state reading lists, published in numerous countries, and translated into many different languages. She lives in Southern California with her family--and an embarrassing number of cats. Find her online at ShannonMessenger.com.

**Number of Pages:** 3968

**Dimensions:** 6 x 8.9 x 10 IN

**Publication Date:** November 19, 2024

## Details

- **Price:** 121.99 USD
- **Vendor:** Books by splitShops
- **Type:** Books
- **Tags:** Books by splitShops, Shopify Collective

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 121.99 USD | In stock |

## Images

- Keeper of the Lost Cities Collection Books 6-9 (Boxed Set): Nightfall; Flashback; Legacy; Unlocked Book 8.5; Stellarlune - Hardcover

---

> Source: [Smart supply deals](https://smartsupplydeals.com/products/keeper-of-the-lost-cities-collection-books-6-9-boxed-set-nightfall-flashback-legacy-unlocked-book-8-5-stellarlune-hardcover)
> Updated: 2026-07-23