In reading order
Spooksville Collection, Volume 1
Christopher Pike
The Secret Path
Christopher Pike
The Howling Ghost
Christopher Pike
The Haunted Cave
Christopher Pike
Spooksville Collection, Volume 2
Christopher Pike
Aliens in the Sky
Christopher Pike
The Cold People
Christopher Pike
The Witch's Revenge
Christopher Pike
Spooksville Collection, Volume 3
Christopher Pike
The Dark Corner
Christopher Pike
Pan's Realm
Christopher Pike
The Wishing Stone
Christopher Pike
Spooksville Collection, Volume 4
Christopher Pike
The Wicked Cat
Christopher Pike
The Deadly Past
Christopher Pike
The Hidden Beast
Christopher Pike