Lost Cities Keeper Wiki
Lost Cities Keeper Wiki
This article is about the unreleased ninth KOTLC book. You may be looking for the idea of Stellarlune.

Stellarlune is the upcoming ninth book in the Keeper of the Lost Cities series. It was announced on May 22nd of 2020 and is scheduled to release on November 8, 2022.[1] The previous book, Unlocked, was released on November 17th, 2020.[2] A preview of the first three chapters of Stellarlune was released in July 2022 at a KOTLC panel at San Diego Comic Con.

On January 26th, 2022, the title of the book was released. On February 16th, 2022 at 5:15 UTC, the book cover was released by Nerdist.

Shannon's contract was supposed to end at the ninth book but was renewed for a tenth book. It is said that Sophie's biological parents will be revealed by the tenth book.

Click here to read the preview.


Sophie Foster changed the game.

Now she's facing impossible choices:

When to act.

When to trust.

When to let go.

Her friends are divided and scattered, and the Black Swan wants Sophie to focus on their projects. But her instincts are leading her somewhere else.

Stellarlune—and the mysterious Elysian—might be the key to everything. But finding truth in the Lost Cities always requires sacrifice. And as the Neverseen's plans sharpen into terrifying focus, it appears that everyone has miscalculated. The Lost Cities' greatest lie could destroy everything. And in the battle that follows, only one thing is certain: nothing will ever be the same.



What We Know[]

  • The book will be released on November 8th, 2022.[1]
  • New art will be released with the publication of this book.
  • Shannon Messenger announced that there will be a tenth book after Stellarlune, which she hopes will be the final one. [3]
  • This book is taking Shannon Messenger longer to write than the other books because she now has a baby to take care of. [4]
  • Jason Chan created the cover art, as he has for the previous books.
  • Karin Paprocki designed the cover, as she has for the previous books.
  • Stellarlune will have an exclusive version like Legacy and Unlocked (including a pull-out poster on the inside of the jacket, two elements with art drawn by Shannon Messenger: an illustration in the case of the book, and special endpapers). It will also have a short story like the past few books.
  • Stellarlune will answer some of the bigger questions about the plot in the series.[5]
  • The color of Iggy for this book is twilight ombre.
  • Ro's hair will be dyed to match Iggy.


The cover displays Sophie (left), Maruca (right), and Marella (top).[6] Sophie and Marella both seem to be using their abilities, with Sophie enhancing Maruca while she creates force fields. Marella seems to be holding a torch with some form of rainbow fire that she may or may not have created. Rainbow fire has only been mentioned as the description for an aurenflare; it could be related to the experiments Marella and Linh were performing in Legacy involving combining their water and fire powers. Flowers that are the same color as the fire surround them in a circle. They could be related to stellarlune.

Sophie is holding a glowing stone of some sort. It may be a leaping crystal or a starstone, but it is most likely a leaping crystal since starstones are not used very often. It is flashing purple; the only purple leaping crystal previously encountered led to Alluveterre.

It is possible that Sophie, Marella, and Maruca may be coming out of the void.

They are all wearing tunics and their Black Swan cloaks. Maruca seems to be the only one wearing a registry pendant (in the form of a choker necklace), though Sophie is wearing her Team Valiant crest on her cloak. The walls around them are probably crystal, which would mean they are in the Lost Cities.

Shannon Messenger told Nerdist that the cover depicts a moment that she has been building towards since the beginning of the series. She also says it may be her all-time favorite cover,[7] and that she's been dying to have a "Girl Power" cover since the series began.[6]

It was illustrated by Jason Chan and designed by Karin Paprocki.[8]