It is the name given to some of the most dangerous inmates in British prisons today, and psychopaths are generally considered to be untreatable. Tom Mangold
reports on an experiment carried out by Dr Bob Johnson, who studied a group of these men for five years, plus pioneering work being carried out at Broadmoor Special Hospital. Panorama examines the secrets locked in the minds of these men, and investigates evidence that successful treatment is possible.

Note: as Panorama is topical and likely to react to events in the news, its subject matter may change