Book details
How to Kill a Monster
Goosebumps, 1996 by R.L. Stine
on Goodreads (5,197)
Description
Stephanie and her brother, Ranger, are sent to stay with their creepy elderly relatives in the middle of the swamp while their parents are on a trip. They soon discover that their relatives have a dark secret. They are able to lock a terrible monster in a hidden room inside the house. Now they must find a way to survive.