New York Times bestselling series!Last month, I was a single preschool teacher whose greatest thrill consisted of color-coding my lesson plans. That was before I learned I was a slayer. Now, it's up to me to face curse-hurling imps, vengeful demons, and any other supernatural uglies that crop up. And, to top it off, a hunk of a shape-shifting griffin has invited me to Greece to meet his family.But it's not all sun, sand, and ouzo. Someone has created a dark-magic version of me with my powers and my knowledge--and it wants to kill me and everyone I know. Of course, this evil twin doesn't have Grandma's gang of biker witches, a talking Jack Russell terrier, or an eccentric necromancer on its side. In the ultimate showdown for survival, may the best demon slayer win.