Nine-year-old Sam Paretta is dead, killed in a plane crash. Even though it's been fourteen months since the accident, his mother, Telly (Julianne Moore), still grieves over the loss. But suddenly, her husband swears they never had a child and her psychiatrist insists she's delusional. But worst of all, there is absolutely no evidence to prove Sam ever existed. Haunted by the memories of her son, Telly's search for the truth propels her into a dark mind-shattering conspiracy of unearthly terror.