Carpe Noctem.

Vampires Skylar and Merrick are in the Avenged Sevenfold clan; taking place in San Bernardino, California. All is well among the seven members, until Skylar trades places with a newly turned vampire the Atreyu shape-shifting pack has taken ransom. Her best friend Merrick has to help the rest of the Avenged clan to save Skylar from the pack of beasts she's forced to be with. To add on top of things, there's a traitor in the wings that no one would have expected.