When Ellie Barker was three years old, her mother was found in a torched Cadillac, overturned on Mulholland Drive, with a bullet in her head.

Many detectives had tried and failed to solve the case.

Decades later, still desperate for answers, Ellie hires LAPD homicide lieutenant Milo Sturgis, who calls in the expertise of brilliant psychologist Alex Delaware, to investigate.

But as the two begin digging, they soon discover a string of dangerous threats still lurking in the present . . .