Forced to Be a Traitor by Jennifer Gitler

In the small town of Westboro, Massachusetts lives high school senior Julia Walters, your average eighteen year old girl. She has fun-loving and loyal friends, a school transcript full of A's and B's, and a caring, supportive, and romantic boyfriend. Having lived in Westboro her whole life, Julia thinks she knows all of the secrets of the town and surrounding area, but the woods turn out to hide more than just squirrels. While out stargazing one night, Julia is surprised to run into Charles, a vampire. Charles introduces Julia to a world that she previously never believed existed. If dealing with vampires wasn't enough, Julia also finds out that her longtime boyfriend is hiding a very big secret.