Team Packer is a covert Catholic strike team against supernatural evil with a secret weapon in its arsenal: 16-year-old Delilah Vincentio—the world's only Christian succubus. Trained by demons to despise humanity and lead them into sin, her unprecedented capacity for mercy caused her to renounce her place in Hell—and gain an angelic referral to Team Packer. Delilah is assigned to infiltrate the Order of the Lightbringer, a Satanic cult that plans to make Pittsburgh a test site for the Apocalypse. After Delilah's identity is almost discovered, Team Packer sends her to high school to hide out until things cool down. But while Delilah may be reformed from her beguiling ways, she's still very much a demon—and she hasn't learned how to play well with others. In fact, trying to fit in and keep a low profile at high school may prove to be a tougher battle than bringing down the Order of the Lightbringer.