This is book number 17 in the Anita Blake, Vampire Hunter series.
A vampire is on a murder spree in Sin City in this Anita Blake, Vampire Hunter novel from #1 New York Times bestselling author Laurell K. Hamilton.
When a vampire serial killer sends Anita Blake a grisly souvenir from Las Vegas, she has to warn Sin City’s local authorities what they’re dealing with. Only it’s worse than she thought. Police officers and one executioner have been slain—paranormal style.
Anita heads to Vegas, where’s she’s joined by three other federal marshals, including the ruthless Edward hiding behind his mild-mannered persona. It’s a good thing Edward always has her back, because, when she gets close to the bodies, Anita senses “tiger” too strongly to ignore it. And the weretigers are powerful in Las Vegas, which means the odds of her rubbing someone very powerful the wrong way just got a lot higher…