Episode 1 - The Trailside Killer: Part One

A killer stalks California; the clues are scarce, until one victim gets away.

Episode 2 - The Trailside Killer: Part Two

A killer stalks California; the clues are scarce, until one victim gets away.

Episode 3 - The Slave Master: Part One

In the mid 1980s, Kansas City women start to vanish; they all share one thing in common, an odd connection to the same man who calls himself "The Slave Master"; police must be just as wily if they want to bring down this serial killing sadist.

Episode 4 - The Slave Master: Part Two

In the mid 1980s, Kansas City women start to vanish; they all share one thing in common, an odd connection to the same man who calls himself "The Slave Master"; police must be just as wily if they want to bring down this serial killing sadist.

Episode 5 - The Twin: Part One

Episode 6 - The Twin: Part Two

Episode 7 - The Times Square Killer: Part 1

Richard Francis Cottingham (born November 25, 1946) is a convicted serial killer and rapist who murdered at least eighteen young women and girls in New York and New Jersey between 1967 and 1980. He was nicknamed as: The New York Ripper, The Torso Killer and The Times Square Killer. Cottingham was arrested on May 22, 1980 and convicted of numerous murders. He was sentenced to multiple life sentences in prison. In 2009, decades after his first five murder convictions, Cottingham told a journalist that he had committed at least 80 to 100 "perfect murders" of women in various regions of the United States.

Episode 8 - The Times Square Killer: Part 2

Richard Francis Cottingham (born November 25, 1946) is a convicted serial killer and rapist who murdered at least eighteen young women and girls in New York and New Jersey between 1967 and 1980. He was nicknamed as: The New York Ripper, The Torso Killer and The Times Square Killer. Cottingham was arrested on May 22, 1980 and convicted of numerous murders. He was sentenced to multiple life sentences in prison. In 2009, decades after his first five murder convictions, Cottingham told a journalist that he had committed at least 80 to 100 "perfect murders" of women in various regions of the United States.

Episode 9 - The Black Widow: Part 1

Episode 10 - The Black Widow: Part 2

Nurse Judy Buenoano survives a string of unimaginable tragedies, including two house fires, a mysterious canoe accident, and the loss of her husband, boyfriend, and child. It is discussed whether Judy is just a magnet for bad luck or if something far more sinister is at play.

Episode 11 - The Happy Face Killer: Part 1

Keith Hunter Jesperson (born April 6, 1955) is a Canadian-American serial killer who murdered at least eight women in the United States during the early 1990s. He was known as the "Happy Face Killer" because he drew "smiley faces" on his numerous letters to the media and authorities. Many of his victims were sex workers and transients who had no personal connection to him. Strangulation was Jesperson's preferred method of murdering, the same method he often used to kill animals as a child. He was eventually arrested and convicted. He is serving multiple life sentences in prison, with no possibility of parole.

Episode 12 - The Happy Face Killer: Part 2

Keith Hunter Jesperson (born April 6, 1955) is a Canadian-American serial killer who murdered at least eight women in the United States during the early 1990s. He was known as the "Happy Face Killer" because he drew "smiley faces" on his numerous letters to the media and authorities. Many of his victims were sex workers and transients who had no personal connection to him. Strangulation was Jesperson's preferred method of murdering, the same method he often used to kill animals as a child. He was eventually arrested and convicted. He is serving multiple life sentences in prison, with no possibility of parole.