Blood Hunters - Vampires, Werewolves and Demons

Amelia, Claire, Jacob and Tyler are just four normal 15 year olds...Or are they? No. For months they have been training...training to kill a vampire/werewolf/demon army who serve the woman known as 'The Black Sorceress' who plans to take over the world and make every single person her slave turning them into either a vampire, werewolf or demon. Just as Amelia, Claire, Jacob and Tyler are sure they about to foil the Black Sorceress's plans, the boys get bitten and scratched by a vampire and a werewolf... What could this mean for them? This must be harder than they thought...