Penny Goodwin shoots her husband in cold blood and there appears to be no motive. Why she has killed him is far from clear. When Hardy starts an investigation, he uncovers a most ingenious plot which even Fleming will not believe.

A woman is found dead by the side of a railway line. Hardy is brought in to help the police. The woman has been murdered, and as they investigate, the police and Hardy realise that they have a dangerous psychopath loose in their area.

A man is found guilty of murdering his wife and sentenced to life imprisonment - could he be innocent? Unquestionably, the facts prove him guilty. Or do they?

A hospital ward is destroyed by fire. Could it be deliberate - and if so, who would want to burn down a hospital and why?

Jo's car is run off the road by a lorry. The driver may be guilty of dangerous driving. Dr Hardy receives a letter threatening his wife's life and demanding he change his evidence. Hardy refuses but it is at the risk of his wife's life.

Dr. Hardy is involved in tracing a ruthless psychotic killer who is employed by the accused in an attempt to suborn witnesses. He is determined to give his evidence, but the police issue firearms to protect his life.