55. Mercedes Lackey - Reserved For the Cat (Elemental Masters, Book 5)

"In 1910, in an alternate London, a penniless young dancer is visited by a cat who communicates with her mind to mind. Though she is certain she must be going mad, she is desperate enough to follow the cat's advice and impersonates a famous Russian ballerina. The cat, it turns out, is actually an Elemental Earth Spirit, and leads her to minor stardom. Meanwhile, the real Russian ballerina has fallen victim to an evil troll who takes over her body and kills her patrons, drinking their life essences in order to strengthen his powers. And soon, the troll focuses his dark attentions on the young dancer..." - Book Description

While I like this series, I really wish she would go back to her Valdemar world. The book was good but it didn't have the character development that the Valdemar ones had and it was really hard to figure out where the book was taking place at the beginning. If you haven't read any of her Valdemar books, then I recommend it. If you have, you may be disappointed. The quality of her writing has gone down unfortunately.