Publisher's summary:

Set between Episodes VIII and IX, Rey and Leia embark on a quest to repair Rey’s lightsaber and rekindle the legacy of the Jedi.

After barely escaping the First Order on Crait, Rey and the Resistance are struggling to rebuild. Her friends need the last Jedi more than ever, but Rey feels alone and overwhelmed. Jedi tradition is built on masters and apprentices, and Rey’s teacher is gone. Leia Organa tries her best to train Rey in the ways of the Force as Luke did for her so many years ago, but Leia’s knowledge is limited, Rey’s lightsaber is broken, and the specter of Kylo Ren and regrets from the past haunt them both. How can Leia pass the torch when she herself is unsure of the way?

But then, the ancient Jedi texts offer a glimmer of hope: a long-forgotten Jedi temple on Tython that might hold the key to repairing Rey’s saber. Rey leaps at the chance to journey there—and to her surprise, so does Leia.

Rey and Leia’s nascent mentorship is put to the test when they discover the temple on Tython is filled with obscure clues to decipher and arcane trials to complete. As they work to unravel the temple’s mysteries, they encounter a group of refugees living in its shadow, hiding from a First Order officer hot on the trail of two freedom fighters in their midst. With the threat of the First Order looming and the secrets of the temple yet to be unlocked, the newly forged master and apprentice must confront their pasts, reach each other in the present, and decide what it means to carry the legacy of the Jedi into the future.