Unfortunately, it took 16 years for Adnan and Gunillas killer to be put behind bars.

They had the murder weapon and a witness who had seen the killer’s face.

However, that was easier said than done.

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One day, the detective was reading something on the internet when he came across a website about genealogy.

A breakthrough came when Stina Eriksson was swabbed and Per discovered that she was Nilsson’s cousin.

The opening scene ofthe Netflix true crime seriesdepictsDavid typing on his computer that he must kill.

Image of John and Per from The Breakthrough

Custom image by Yailin Chacon.

So, when he found Adnan and Gunilla, he murdered them in cold blood.

SinceDavid admitted to being the one behind the murder, he was ultimately convicted of the crime.

David Nilsson looking sinister in The Breakthrough

The Breakthrough is a crime drama that follows a detective joining forces with a genealogist to solve a 16-year-old double homicide before it becomes a cold case, piecing together the mystery in a race against time.

This image shows Marie Adler from Unbelievable, Marcia Clark from American Crime Story, and Berchtold from A Friend of the Family.

David Nilsson looking sad in The Breakthrough

Peter Eggers as John Sundin in The Breakthrough

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The Breakthrough