What if you were a young, single mother, desperate for a place of security after two years of trauma, who moved with her seven-year-old son back to her childhood home, and finds it inhabited by the malevolent ghost of her dead twin sister? Kate Foster finds herself in serious jeopardy, as it appears her twin, Leah, is bent on revenge for an act of Kate's that Leah believes led to her death. Kate has only two allies: her life-long best friend, Bree, and a former heartthrob, Cass Reynolds. The muddy and frightening waters of this terrifying summer are made bearable only by the dawning love between Kate and Cass, and the melding of their lives.