How do you know if you are insane? Riley Carpenter, her devoted husband, Morgan, and their beautiful baby daughter, Vivian, live in a small rural town in Northern California. After Riley and Vivian survive a savage car accident, Riley begins to hear a strange voice that no one else seems to hear. Riley dismisses the phenomenon as her imagination at first, but soon the strange Voice makes eerie predictions about the near future that inevitably come true. Despite fears for her own sanity, Riley and the Voice make a vow to protect her family no matter the cost.