After surviving near fatal bites from three strigoi vampires, tattoo artist Riley Poe has absorbed their powers and is stronger than ever. Just as she's learning to harness her newfound abilities, she and her vampire guardian fiance Eli Dupre agree to join the elite Worldwide Unexplained Phenomena team. This task force, composed of vampires, druids and werewolves has been assigned to take down the Black Fallen, a powerful race of fallen angels. They are searching for the ultimate source of power in Edinburgh and Riley will be the weapon to stop it.