The entire school is talking about the gorgeous new math teacher, Mr Beck. That is, everyone except Kaylee Cavanaugh. After all, Kaylee's no ordinary high-school junior. She's a banshee - she screams when someone dies. And that hot new teacher is really an incubus who feeds on the desire of unsuspecting students. The only girls immune to his lure are Kaylee and Sabine - her boyfriend's needy ex-girlfriend. Now the unlikely allies have to get rid of Mr Beck before he discovers they aren't quite human, either.