Guess what? I wrote a book called The Creepy Chronicles of Monsterain: The Quest for the Dark Diamond. Here's the synopsis:

When Alicia’s mother brings her to her new home, an old run down house in a mysterious dark town, it is close to Halloween. Alicia stumbles through a portal that leads to a strange world of ghouls,

 vampires,

 and monstrous creatures of all sorts.

She learns that her only way out is to find a wish granting Dark Diamond. Finding it involves dangers, and bizarre encounters. Some of the world’s inhabitants are kind and helpful, or at least they seem to be. Others are definitely not nice. Alicia faces her fears and discovers a strength and determination that grows with each encounter, but will they be enough to save her? Will she ever get back home and will she learn why this world exists at all?

It is available at amazon.com, barnesandnoble.com and xlibris.com