The Werewolf of Fever Swamp (Goosebumps Series)

The Werewolf of Fever Swamp - R.L. Stine This is my second favorite goosebumps book. Its got werewolf in it, duh :D grady and his family move to the swamp lands to start a new and his parent are scientists. Late at night they hear howling and animals end up being killed all around them. Is it gradys new big wolf dog or is it the creepy swamp hermit?