My Math Teacher is a Vampire (Stewards of Light Book 2)

Book 2 of 'The Stewards of Light' series, and sequel to 'My Science Teacher is a Wizard.' Blake Drywater and his fellow unfortunate students at Millard Fillmore Middle School once more find themselves facing an unexpected creature in one of their classes. Because of a sudden 'neck disorder' suffered by their math teacher, Blake and his classmates receive a chilling substitute. His name is Mr. Coagulate, who has a strange fascination with blood and dreams.
Meanwhile Blake's former science teacher, Mr. Marlin, uses his wizard skills to annoyingly turn himself into objects in Blake's classroom--objects that talk to Blake, but which no one else can hear. Mr. Marlin warns Blake that his substitute math teacher is actually a vampire, determined to enslave Blake and use him as an unwilling warrior in the battlefield of vampire nightmares. And in spite of Blake's best efforts to stay out of such a horrible place, he unwillingly finds himself in the midst of the vampire battle one night, where he learns that nothing ever works out the way it should.