Return to Ghost Camp is a novella written by R. L. Stine. It was first published in 1999 and was the 19th book in the Goosebumps Series 2000 book series.
Description[]
While on a bus ride to Camp Spirit Moon, Dustin befriends a boy named Ari who suggests that the two switch places, which makes Dustin (as Ari) the most popular kid in the camp -- until he learns that a boy named Ari has been named the camp's newest sacrifice to a forest monster known as "The Snatcher".