Jim Cliskey was a murderer from the 1930s.
In 1937, the Cadets threatened to make Alistair Gordon Lethbridge-Stewart stay overnight in the 'haunted' Pengriffen fougou. Henry Barns, who had gone home early, was unaware this hadn't happened and went to the moors to warn the other cadets about a stranger spotted around there; he was then held prisoner by the man, escaped murderer Jim Cliskey. When James took the Cadets to find and rescue Henry Barns, Alistair was taken along and helped alert the police, endearing him to the group. (PROSE: The Bledoe Cadets and the Bald Man of Pengriffen)