Spook House — Gail Z. Martin

Cassidy is called in to help when a Halloween haunted house attraction turns dangerous with real supernatural creatures. The race is on for Cassidy and Teag to settle the restless spirits before visitors get more than they bargained for.

This series of adventures spans over 500 years, from the 1500s to modern day as a small cabal of vampires and their human helpers battle supernatural enemies to find and destroy dangerous magical items and keep the world safe from dark forces.