In reading order
Escape from Grimstone Manor (Monsterious, Book 1)
Matt McMann
The Snatcher of Raven Hollow (Monsterious, Book 2)
Matt McMann
Terror in Shadow Canyon (Monsterious, Book 3)
Matt McMann
The Beast of Skull Rock (Monsterious, Book 4)
Matt McMann
Trapped in the Horror Dome (Monsterious, Book 5)
Matt McMann