#21 Kitty and the Dead Man's Hand by Carrie Vaughn
This is the fifth book in the series and it starts with Kitty deciding to elope to Vegas but that doesn't work out as a quicky getaway and soon she is delivering notes to the master vampire of Vegas and hosting her show for a live audience. Of course her hotel is hosting a bounty hunter convention and several people there know Ben but don't know he is a werewolf. Kitty find a mystery there on why there are no werewolves in Las Vegas and makes both a new ally and enemy by the end of the book. I do recommend having the next book to read right after this one since the publisher was good enough to publish them back to back and the events in book 6 happen because of what happens in Vegas.