When young, beautiful Cassie Jensen arrives at the intensive care ward of St. Catherine's hospital after being struck by a hit-and-run driver while out walking her dog, chief nurse Alice Marlowe thinks she looks familiar. She starts obsessively digging deeper into Cassie's relationships, only to discover a secret that her patient has been keeping from everyone, including her devoted husband and family. Frank, a patient on the same ward who has locked-in syndrome, can hear and see everything around him but cannot speak. Soon he comes to understand that Cassie's life is still in danger. While the police continue to look for clues, Frank knows the truth, but he's unable to communicate it. As Frank's resolve deepens, and Alice puts her own career on the line in her single-minded search for answers, the reader will get closer and closer to the truth of who Cassie Jensen was, and why she was out on the road that fateful night.