Vampire City, tome 10
Rachel Caine2011

After discovering that vampires populate her town, college student Claire Danvers knows that the undead just want to live their lives. But someone else wants them to get ready to rumble.

There's a new extreme sport getting picked up on the Internet: bare- knuckle fights pitting captured vampires against each other-or humans. Tracking the remote signal leads Claire- accompanied by her friends and frenemies-to discover that what started as an online brawl will soon threaten everyone in Morganville...

Titre original : The Morganville Vampires, book 10 : Bite Club (2011)