"All alone now." These were the only three words written by Robert Maudsley in a final letter to a psychiatrist in the 1990s.
Dubbed one of Britain's 'most dangerous prisoners', Maudsley has spent four decades in solitary confinement, locked in a bulletproof glass box below HMP Wakefield in Yorkshire.
Dubbed 'Monster Mansion', the category A prison has a long history of holding some of the country's most dangerous criminals.
One of its infamous former inmates was Harold Shipman, considered to be one of the most prolific serial killers in modern history.
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