Dakota Kilroy, a twenty-eight-year-old investigative journalist, is haunted by the unsolved disappearance of her best friend, Maddy Montgomery, who went missing at the age of fifteen. When financial difficulties force her to move back home to Santa Monica, California, she cannot take the unanswered questions anymore. Determined to find out what happened to Maddy, Dakota starts ShadowCast, a true-crime podcast to publicize the case. But little does she know that the man responsible for Maddy's disappearance all those years ago is listening in and tampering with her investigation.