Rob has spent her life running from Sundial, the family's ranch deep in the Mojave Desert, and her childhood memories. But she's worried about her daughter, Callie, who collects animal bones and whispers to imaginary friends. It reminds her of a darkness that runs in her family, and Rob knows it's time to return. Callie is terrified of her mother. Rob digs holes in the backyard late at night and tells disturbing stories about growing up on the ranch. Soon Callie begins to fear that only one of them will leave Sundial alive...