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The Forever Witness: How DNA and Genealogy Solved a Cold Case Double Murder

by Edward Humes

A cold case at the crossroads of DNA and privacy

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Awards & Recognition

  • Critical praise

    Praised by The Wall Street Journal as a thought-provoking true-crime book

    The Wall Street Journal describes the book as thought-provoking and praises its treatment of questions about bal...

AlbakiReads Editorial

A cold case at the crossroads of DNA and privacy

Edward Humes traces the investigation into the 1987 murders of Tanya Van Cuylenborg and Jay Cook, following the case from its initial dead end to the use of genetic genealogy decades later. The account brings together Detective Jim Scharf’s review of the evidence and genealogist CeCe Moore’s role in applying family-tree research to forensic DNA. The case also opens onto a wider question: how far genetic information gathered for ancestry research should be used in criminal investigations. Humes places one investigation within the broader emergence of genetic genealogy as a tool for solving cold cases, while keeping the stakes of privacy and public safety in view.

Good fit for readers who enjoy

  • True-crime readers interested in cold-case investigations and forensic evidence.
  • Readers curious about genetic genealogy and its use in criminal investigations.
  • Readers interested in questions of DNA privacy and public safety.

Themes

Cold-case investigationForensic DNAGenetic genealogyPrivacy and public safety

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Book overview

"Thought-provoking true-crime thriller...the book raises urgent questions of balancing public and private good that we'll likely be dealing with as long as the title implies."--Wall Street Journal

A relentless detective and a civilian genealogist solve a haunting cold case--and launch a crime-fighting revolution that tests the fragile line between justice and privacy.

In November 1987, a young couple from the idyllic suburbs of Vancouver Island on an overnight trip to Seattle vanished without a trace. A week later, the bodies of Tanya Van Cuylenborg and her boyfriend Jay Cook were found in rural Washington. It was a brutal crime, and it was the perfect crime: With few clues and no witnesses in the vast and foreboding Olympic Peninsula, an international manhunt turned up empty, and the sensational case that shocked the Pacific Northwest gradually slipped from the headlines.

In deep-freeze, long-term storage, biological evidence from the crime sat waiting, as Detective Jim Scharf poured over old case files looking for clues his predecessors missed. Meanwhile, 1,200 miles away in California, CeCe Moore began her lifelong fascination with genetic genealogy, a powerful forensic tool that emerged not from the crime lab, but through the wildly popular home DNA ancestry tests purchased by more than 40 million Americans. When Scharf decided to send the cold case's decades-old DNA to Parabon NanoLabs, he hoped he would finally bring closure to the Van Cuylenborg and Cook families. He didn't know that he and Moore would make history.

Genetic genealogy, long the province of family tree hobbyists and adoptees seeking their birth families, has made headlines as a cold case solution machine, capable of exposing the darkest secrets of seemingly upstanding citizens. In the hands of a tenacious detective like Scharf, genetic genealogy has solved one baffling killing after another. But as this crime-fighting technique spreads, its sheer power has sparked a national debate: Can we use DNA to catch the murderers among us, yet still protect our last shred of privacy in the digital age--the right to the very blueprint of who we are?
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