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A young teacher is murdered days before Christmas in 1992, and the case goes cold for twenty-five years until a new forensic technique reopens the hunt.

Three women are attacked after answering Craigslist ads in Boston, and a trail of emails, IP addresses, and burner phones leads police toward an unlikely suspect.

Two roommates are murdered on Halloween night in Napa, and a pioneering forensic technique sets out to build a picture of a killer from the genetic code he left behind.

A 71-year-old businesswoman vanishes after a routine property meeting in London, and the digital breadcrumbs left behind reveal a much darker reality.

A Memphis teacher and mother is abducted during her pre-dawn run, and a single abandoned sandal becomes a key thread in the search for her killer.

A church choir member is shot dead in a parking lot, and the painstaking work of mapping thousands of phone records begins to reveal a hidden web of connections.

Two brilliant French students are tortured and murdered in London, and a blood-stained bank card swallowed by an ATM holds the answer to what triggered the attack.

A 15-year-old boy is fatally stabbed at London's Victoria Station, and a storm of teenage messages and the station's vast CCTV network become central to the case against his attackers.