Vampire hunter or serial killer? That depends on whether vampires exist . . .

Simon Helsing believes the only way to stop a bad guy with fangs is a good guy with a stake. He has devoted his life to ridding the world of vampires. He hunts them, finds their daytime lairs, and pounds a stake through their hearts.

Lexi Tarada wants to believe. She's desperate to prove that the strange and impossible can be real. She runs a website for the unexplained and tries to sift through the crazy conspiracy theories to find out what is - or might be - real.

Detective Todd Carrow is a skeptic. Haunted by visions of brutal killings from a previous case, he sees the latest gruesome murders as nothing more than the actions of a madman targeting innocents.

Helsing is convinced he's doing good, but what if vampires aren't real and Carrow is right?