Dig Two Graves

"Seventeen-year-old film noir fan Neve Lanier is a girl who just wants to be seen, but doesn't really fit in anywhere. When Neve is betrayed by her best friend, Yasmin, at the end of the school year, she heads off to a girl's empowerment camp feeling like no one will ever love her again. So when she grabs the attention of the beautiful, charismatic Diane, she falls right under her spell, and may accidentally promise to murder Diane's predatory step-brother, Javier, in exchange for Diane murdering Yasmin. But that was just a joke...right? Wrong. When Yasmin turns up dead, Diane comes calling, attempting to blackmail Neve into murdering Javier. Stalling for time, Neve pretends to go along with Diane's plan until she can find a way out that doesn't involve homicide. But as she gets to know Javier - and falls for him - she realizes that everything Diane told her is a lie. Even worse, she discovers that Yasmin probably wasn't Diane's first victim. And unless Neve can stop her, she won't be the last."--