Fifteen-year-old Courtney Hoffman is determined not to go insane like her crazy grandfather did―right before he tried to drown her when she was seven. But something is happening to her. She’s being visited in her bedroom at night by aliens who claim to have shared an alliance with her now-dead grandfather. And Courtney knows that aliens aren’t real, which means she must be going crazy. And her mother and her new boyfriend have zero tolerance for craziness.
Then Courtney meets Agatha Kirlich, a mysterious older girl with sleuthing skills and alien-obsession issues of her own, and together―armed with ancient stories of a human-alien bloodline, a few photographs, and the creepy tattoo left on Courtney’s rib cage by her grandfather before he disappeared―the girls embark on a mission to uncover the truth about Courtney’s alien visitors. Ultimately, Courtney must put her fears aside, defy her mother, embrace her true identity, and risk everything in order to save herself―and the world.