The Devil You Know - Season 4 (2013)

A beautiful psychology student vanishes without a trace in Manhattan. Was her plastic surgeon husband responsible? Her grieving sister, Alayne Katz, believes so, and almost loses hope that justice will ever be served until a grisly discovery is made.

As women are attacked on the streets of Ocala, FL, a young mother begins to have suspicions about her husband. Melissa Fountain's life will be turned upside down when she learns his dark secret.

As young women begin to go missing across the Midwest, police are on the hunt for a twisted serial killer. A confidential informant goes inside a maximum security prison to look for answers.

A sister suspects her troubled brother knows more than he should about women who are missing from the streets of Edmonton. She makes a shocking discovery when she looks inside his hockey bag.

A son supports his father through his cancer treatments, but he discovers something big. His father had been living a double life this whole time.