T. L. Carlyle 
The Mystery of Cranewood Manor [EPUB ebook] 

When a wealthy heiress goes missing, her father hires famed private investigators Val Saxon and Laura Hampstead to search for her. The clues lead them to Maine and a castle overlooking the sea. The owner is a man who dabbles in the occult, and was the last one to see the missing woman alive. But as the investigation moves from the dark arts into the realm of murder, a man with a dark secret of his own helps them to solve the case.