Dr Harold Shipman was, by every outward measure, a pillar of the community: attentive, well liked, and never too busy for a chat with his patients.

Behind that reassuring bedside manner, however, was the man who became Britain's most prolific serial killer, responsible for the deaths of at least 200 patients over a 25-year campaign of murder that went undetected for decades.

Drawing on court records and years of research, Wensley Clarkson examines how Shipman was able to hide in plain sight for so long — and looks at the devastating effect his eventual exposure, and suicide, had on the families of his victims.