I’m Alexa, Defender of Mankind... Time to prove my namesake correct. I’m going to make humans stronger and faster to fight off vampires... I’m going to make them vampire slayers...

They were born to fight. Created to win. But the question remains... Who's the real enemy? When Sadie heads out for the night, she hardly expects to witness a murder—much less a murder committed by a dangerous vampire with a thirst for vengeance and destruction. Within a few hours, Sadie and her boyfriend Aaron are pulled into a violent vampire world. Searching for a way to survive, they know they must fight, but this might be a battle they just can't win.

Realizing she must protect her family, Sadie relents, accepting her destiny as a Vampire Slayer. When Aaron is attacked, it's up to her to learn how to take down the vampires. Learning that the man and vampire protection treaty was violated, Sadie realizes that only Slayers can restore world balance . The Training Institute will transform her into a Vampire Slayer. In no time, Sadie discovers that she is stronger, faster, and swifter than any of the other candidates; she is the ultimate slaying machine. But why?