Obsession: Dark Desires - Season 4

When Idaho hairdresser Makaela Zabel-Gravatt begins cutting the hair of truck driver Christopher Wirfs, little does she realize that it signals the start of a two-year long nightmare that will end in the most heart-stopping and disturbing way.

When a single mother of two bumps into her old schoolmate, she thinks she's met her soul mate. But his charm hides a possessive, violent man. After they separate, his obsession deepens and she fights to protect her family.

When Olympic gold medalist Sheila Taormina agrees to help wannabe triathlete James Ludham, she doesn't know he wants more than just coaching. His dark fantasies take over her life until she has no other choice but to face him, and her fears, head on.

Katie Call's life spirals into a terrifying nightmare as her ex, Todd, refuses to accept the collapse of their relationship. Without her knowing, he hides video cameras and microphones in her home, biding his time to wreak a bloody revenge.

Christine's life with abusive husband Shane is a cycle of fear, humiliation and violence; after Christine escapes with her children, Shane sets off in pursuit, kicking off a series of terrifying and shocking events leading to a bloody conclusion.

Michelle ends her relationship with alcoholic Richard and is looking forward to getting on with her life, but Richard can't let go, and his growing obsession will lead to a violent conclusion.