Los Angeles detective Jack Radcliff (David Oyelowo) receives a distressed phone call from his niece Ashley (Storm Reid) and rushes to the rescue only to find the girl and her parents dead in an apparent murder-suicide. Then, just as the police department declares the killings an open-and-shut case, Jack gets another call from Ashley.

With the cell-phone connection acting as a link between the past and the present, Jack urges Ashley to collect clues that will help him to solve her murder and change her fate.