Gravity (Gravity #1)

A lost friend, a new love, and a town full of secrets... One night in the town of Hell, Ariel's best friend goes missing. Those around her believe Jenna ran away, but when Ariel is tormented by nightmares and paranormal activity, she realizes Jenna's disappearance was part of a bigger mystery. Ariel's obsession with haunted houses and horror movies makes her the perfect detective.

But to complicate matters, a handsome newcomer named Henry Rhodes plagues her with unwanted attention. Though he doesn't believe in the supernatural events, she enlists his help and that of quirky nerd Theo. What is making the lights at school flicker? And why did Ariel dream of the old abandoned Dexter orphanage? When Ariel finally discovers the truth, it's much worse than she ever feared.