There are 3 books in the The Locked Tomb Series series. The newest book is Nona the Ninth which came out in 2022.

1
Gideon the Ninth

Book cover of Gideon the Ninth
15+ pages of new, original content, including a glossary of terms, in-universe writings, and more!

A USA Today Best-Selling Novel!

"Unlike anything I've ever read. " --V.E. Schwab

"Lesbian necromancers explore a haunted gothic palace in space!" --Charles Stross

"Brilliantly original, messy and weird straight through." --NPR

The Emperor needs…

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2
Harrow the Ninth

Book cover of Harrow the Ninth
Harrow the Ninth, the sequel to the sensational, USA Today best-selling novel Gideon the Ninth, turns a galaxy inside out as one necromancer struggles to survive the wreckage of herself aboard the Emperor's haunted space station.

"Lesbian necromancers explore a haunted gothic palace in space! Decadent nobles vie to serve…

3
Nona the Ninth

Book cover of Nona the Ninth
Her city is under siege.
The zombies are coming back.
And all Nona wants is a birthday party.
In many ways, Nona is like other people. She lives with her family, has a job at her local school, and loves walks on the beach and meeting new dogs. But Nona's…