Mike Silverman began his career as a biologist with the Forensic Science Laboratory at New Scotland Yard. He was instrumental in the introduction of the first automated fingerprint retrieval system, and has worked closely with many organizations within the criminal justice system, including the Crown Prosecution Service and the British Association of Forensic Medicine. Tony Thompson is the bestselling author of Gangs and Gang Land. He won the prestigious Crime Writers' Association Gold Dagger for Non-Fiction with The Infiltrators (2001) and is the former crime correspondent for The Observer.