Single mother Loretta (Kathryn Hahn) fell in love with her English teacher at the age of 19, and then gave birth to two children, but her husband eventually left her. The failed marriage made Loretta's life a mess, and she also broke off relations with her parents. After many years, her parents who had not met for a long time contacted Loretta, hoping to reconcile. Although the mother was reluctant to go, she finally followed the wishes of her daughter Becca (Olivia DeJonge) and son Taylor (Ed Oxenbould) and let the children take a car alone to another city to visit their grandfather (Peter McRobbie) and grandmother (Deanna Dunagan). Becca carried a camera with her, hoping to record every bit for her mother. Who would have thought that the two children actually recorded the darkness under the sun...