Serial killer Patrick Mackay was dubbed the most dangerous man in Britain when he appeared in court in 1975 charged with three killings, including the axe murder of a priest. The Nazi-obsessed alcoholic had stalked the upmarket streets of West London hunting for victims and was suspected of at least eight further murders. Now, after more than 40 years behind bars, where he has shunned publicity, Mackay has been allowed to change his name and win the right to live in an open prison - bringing him one step closer to freedom. For the first time, Britain's Forgotten Serial Killer reveals the full, untold story of Patrick Mackay and the many still-unsolved murders linked to his case.