Ep 3. The Scent of Darkness

In Prime Suspect season 4 episode 3, titled "The Scent of Darkness," Detective Superintendent Jane Tennison (Helen Mirren) investigates the brutal murder of a young girl in a squat. The initial investigation focuses on the homeless inhabitants of the squat, who are known to have a history of drug abuse and violent behavior.

Tennison's team questions everyone in the area, including the girl's boyfriend and the other squatters in the building. As the investigation progresses, Tennison becomes convinced that there is more to the case than meets the eye. She begins to suspect that the killer may have been a professional hitman, hired to target the girl for unknown reasons.

Meanwhile, Tennison deals with personal issues, including her father's failing health and her contentious relationship with her sister. These personal struggles begin to take a toll on Tennison's mental health, leading her to turn to alcohol for solace.

As the investigation unfolds, Tennison must confront her own demons and learn to trust her instincts in order to solve the murder and bring the killer to justice. Ultimately, Tennison's persistence pays off as she uncovers a shocking conspiracy that puts her own life in danger.

"The Scent of Darkness" is a tense and gripping episode that showcases the talents of Helen Mirren in the role that made her a television icon. With its complex and nuanced portrayal of a flawed and determined detective, this episode is a must-see for fans of the crime genre.