From Google:

Fifteen-year-old Lynda Mann's savagely raped and strangled body is found along a shady footpath near the English village of Narborough. Though a massive 150-man dragnet is launched, the case remains unsolved. Three years later the killer strikes again, raping and strangling teenager Dawn Ashforth only a stone's throw from where Lynda was so brutally murdered. But it will take four years, a scientific breakthrough, the largest manhunt in British crime annals, and the blooding of more than four thousand men before the real killer is found.

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A true story of the first widespread use of DNA fingerprinting to solve a crime. In this case, two girls were horribly raped and murdered in the quiet English village of Narborough. There were few clues and no witnesses. Joseph Wambaugh was an ex-cop who wrote both fiction (The New Centurions) and non-fiction (The Onion Field). Here he tackles the story of the first murder case that was resolved with DNA fingerprinting. A revolutionary tool in the mid-1980's. It is an interesting look at the dogged pursuit of justice for these victims by the police. Huge teams searched and canvassed neighborhoods trying to get a lead. A new technology was then tried that resulted in thousands of men being "blooded" to eliminate them as suspects. Colin Pitchfork was eventually tracked down - but (view spoiler) A quick internet search finds that while Pitchfork was eventually released on parole, he was returned to prison within a few months for violating the conditions and approaching young women.

One interesting quote / tidbit:

...surveillance and arrest of a major felony suspect is done differently in Britain...In Britain a suspect under observation is often allowed to enter his house so that he can't run away. In a gun-crazy country like the U.S. the last thing the police want to do is let any suspect enter his house, where he may have enough firepower to take the Persian Gulf.