Brimstone two novels : Prom dates from Hell and Hell week

In Prom dates from Hell, high school senior and yearbook photographer Maggie thought she would rather die than go to prom, but when a classmate summons a revenge-seeking demon, she has no choice but to buy herself a dress and prepare to face jocks, cheerleaders, and Evil Incarnate. Then, in Hell week, college freshman Maggie reluctantly endures mixers, rites, and peculiar rules while working undercover on a series of stories for her campus newspaper, but soon learns that members of the sorority to which she has pledged have strange powers and a terrible secret.