Epic Tales from Adventure Time: The Lonesome Outlaw

Epic Tales from Adventure Time: The Lonesome Outlaw an Adventure Time novel written by T. T. MacDangereuse and illustrated by Christopher Houghton. It was published by the Penguin Group and was released September 29, 2015.

Summary
''The third novel in the Epic Tales from Adventure Time series takes the adventure to the Wild West and stars Marceline as a notorious outlaw on the run. The series, based on an idea from Adventure Time creator Pendleton Ward, features the show's beloved characters in stories inspired by classic pulp novels (with a touch of romance) in a fan-fiction version of Ooo.''