According to the Evidence

It is 1955 and Dr. Richard Pryor has been called out to what appears to be an accident at a mechanic's shop.  A tractor under repair has dropped onto a man.  However, upon examination, Pryor isn't so sure.  He will know more when he does an autopsy.

With the help of his partner, Dr. Angela Bray, Pryor is able to determine that the victim was strangled and then hung before being crushed by the tractor.  DI Crippen definitely has a homicide on his hands.

Pryor has also been asked to serve as a witness for the defence in the case of a vet who has been charged with injecting his ill wife with potassium chloride to hasten her death.  Pryor is able to turn to recent developments in forensic medicine to help the defence solicitors with their case.

A suicide brings the case of the tractor homicide to a close.  However, calls to Europe and America are in order to confirm information needed for the other case.

Meantime, the army brings Pryor a case; is it an accidental killing or a murder. Since it happened in the Middle East, he has only grainy autopsy pictures to look at.  The bullet is also still there.  An exhumation of the soldier is needed to gather more information.  That exhumation would prove Pryor's theory.

Author Bernard Knight presents forensic evidence in great detail as he takes the reader through the Assizes Court and murder trial.  A fascinating read.