42 books • 6 series
Book #1: The Tenth Ghost
Book #2: The Ninth Guest
Book #3: The Eighth Room
Book #4: The Seventh Secret
Book #5: The Sixth Stone
Book #1: Budget Cuts
Book #3: Hunter
Book #2: Fire and Water
Book #6: Family Matters
Book #1: So You Want to be a Vampire
Book #2: Transformation
Book #1: The Prince of Shadows
Book #2: Lost in the Shadows
Book #3: Bound in Shadows