Kris and Bruce Jenner's daughters are collaborating with co-writer Maya Sloane for their debut book, a sci-fi story about two sisters set 200 years in the future, reported Daily Star.
The untitled book is due to hit shelves next summer and Kylie, 14, and Kendall, 16, hope it will be the first in a series.
"We want to do something so different, something that we really love," Kylie said.
"I think we will definitely get it done soon with how fast the process is going," Kendall added.
