This book is part of a book series called Endling Series .

This book has been graded for interest at 8-12 years.

This book was published 2019 by HarperCollins .

K. A. Applegate is the author of the bestselling Animorphs series, as well as the Remnants and Everworld series, Home of the Brave, and the Roscoe Riley Rules series. She lives in Tiburon, California.