Part 1 of 3: Thorne investigates an elusive serial killer. His inquiry is complicated by the fact that the only witness-a woman who survived her encounter with the killer-is suffering from locked-in syndrome and unable to communicate.

Part 2 of 3: Thorne investigates an elusive serial killer. His inquiry is complicated by the fact that the only witness-a woman who survived her encounter with the killer-is suffering from locked-in syndrome and unable to communicate.

Part 3 of 3: Thorne investigates an elusive serial killer. His inquiry is complicated by the fact that the only witness-a woman who survived her encounter with the killer-is suffering from locked-in syndrome and unable to communicate.

Part 2 of 3: After two women are murdered within hours of each other, Thorne races to find the culprit. Realizing there are parallels to an earlier case, Thorne is stunned to discover that he's on the hunt for two serial killers. The pair seem to be working in tandem, yet killing separately.

Part 3 of 3: After two women are murdered within hours of each other, Thorne races to find the culprit. Realizing there are parallels to an earlier case, Thorne is stunned to discover that he's on the hunt for two serial killers. The pair seem to be working in tandem, yet killing separately.