According to the Evidence by Bernard Knight

A forensic mystery of the 1950s - After starting their risky venture of a private forensic consultancy, Doctor Richard Pryor - now a Home Office pathologist - and forensic biologist Angela Bray have now become firmly established. An apparent bizarre suicide in a remote Welsh farm starts them on a new investigation, which is followed by an unusual request from the War Office. And when a Cotswold veterinary surgeon is charged with poisoning his ailing wife, can Pryor's expert evidence save him from the gallows?