In Seattle, Det. Sarah Linden is on what is supposed to be her last day on the job. She and her son Jack are supposed to leave that evening to join her fiancé in Sonoma. Her replacement, Det. Stephen Holder, is ready to take over but they answer a call from a patrol car who have found a bloodied sweater in a field. When the missing girl, Rosie Larsen, is found in the trunk of a car at the bottom of a lake it turns out the car is registered to the campaign committee for councilman Darren Richmond, who is running for mayor. Linden delays her departure for what she hopes will be only a few days.

The Sinner follows a young mother who, when overcome by an inexplicable fit of rage, commits a startling act of violence and to her horror has no idea why. The event launches an inverted and utterly surprising crime thriller whose driving force is not the "who" or the "what" -- but the "why" -- as an investigator finds himself obsessed with uncovering the woman's buried motive. Together they travel a harrowing journey into the depths of her psyche and the violent secrets hidden in her past.

2017 American crime drama television series

Two FBI agents, fighting the departmental stigma of backroom boys - those who try to complicate the status quo of simple Means, Motive, Opportunity (MMO) of crime-solving with academics - work to develop an innovative investigative field incorporating psychology, anthropology and sociology as a method to reveal the motive. They acknowledge classic crime-solving - MMO - as no longer sufficient because criminality is becoming more complicated as Motive graduates from need and greed to inexplicable and irrational reasons. They theorize applying deeper psychological evaluation will posit new questions. Simply, asking Why will lead to the Who. This series focuses on the development by two men, two agents, of a new criminal field and does so through story lines of visiting the sociopathic mind.

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