A killer is terrorizing 1970s Los Angeles, leaving victims posed across the Hollywood Hills. When Kenneth Bianchi lands in custody in 1979 for a double murder in Bellingham, Washington, LAPD detectives quickly link him to the elusive "Hillside Strangler." Yet a twist emerges: in startling taped sessions with psychiatrists, Bianchi insists he’s innocent—the real culprit is his alternate personality, "Steve." And as those interviews unfold, he hints at even darker secrets waiting to surface.