A new kind of DNA analysis changes everything. After learning how genetic genealogy helped identify an unknown victim in a kidnapping case, Paul Holes begins to wonder whether the same method could be used to find the Golden State Killer. Working with a small team, he uses an SNP profile to identify distant relatives and build family trees that may ultimately lead to a name. After decades of dead ends, the case begins to move with astonishing speed – culminating in, at last, the arrest of Joseph D’Angelo.

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