14 year old Nate Valenzuela and his younger sister, 11 year old Kameron Valenzuela, have lived in the same house in the same neighborhood for their whole entire lives. Then, 13 year old Ellie Carter moves into the house next door to them. But as time progresses and Nate and Kameron grow more used to Ellie being their neighbor, they also grow more intrigued by her presence, as well as the strange things they see happening through the windows of her house. So Nate and Kameron decide to do something about it. And this leads to many things neither of them have dreamed of before.