There are 2 books in the Dread Nation Series series. The newest book is Deathless Divide which came out in 2020.

Trained at Miss Preston's School of Combat for Negro Girls in both weaponry and etiquette, Jane McKeene is poised for a successful career protecting the wealthy from the encroaching plague of walking dead. But when families begin to go missing, Jane uncovers a conspiracy that pits her against some powerful…
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2
Deathless Divide

Book cover of Deathless Divide
"Savvy, enlightening, and harrowing" Buzzfeed on Dread Nation

After the fall of Summerland, Jane McKeene hoped her life would get simpler: Get out of town, stay alive, and head west to California to find her mother. But nothing is easy when you're a girl trained in putting down the restless…