The Mad Hatter's Haunted Castle — Elisabeth Crabtree

A new amusement park has sprung up in Hatter's Cove just in time for Halloween and Kat Archer, reporter for the Hatter's Cove Gazette, is dying to get into the park's main attraction: the Haunted Castle.
The castle, a grand sprawling structure located on a tiny island off of the coast, was supposed to be the crown jewel of the park but for some unknown reason it has been declared off-limits to the general public since the park opened.
With access to the castle limited to only a few chosen guests, rumors have been running rampant around town. Most of the townsfolks blame the supposed ghost that haunts the island for keeping the castle doors closed. Kat, however, suspects that there is a far more rational explanation and is determined to get an exclusive invitation into the castle in order to investigate.
But when Madison Hatter, one of the park's owners, is murdered by what appears to be a ghost, Kat starts to wonder if the castle's ghost story is more than just a fancy marketing gimmick but in actuality the product of a diabolical mind.

A cozy novel: approximately 61,000 words and 225 pages