Blood and Embers. Gathering of Magic, #2

When Ellis Avalon walks into her office, private detective Lilith Covington immediately dislikes the immensely handsome, charming stranger who wants to hire her for an undercover job at a yearly party for the magical elite on Ellis's own private island. Ellis believes that she is being sabotaged by her friends -- the party guests -- and that Lilith is the only one capable of figuring out who is not to be trusted.
Fascinated by the beautiful detective she has vetted for months, Ellis knows that there is no other person she can trust for the job other than Lilith. But Ellis holds a secret about the magnetic but impossible woman she has chosen to pose as her fiancée at the party, one that will put her further at odds with the detective while putting dozens of party guests in danger of a fiery end.