Greyfriars turns out to be highly popular as a base for disguised burglars. The “Courtfield Cracksman” (Magnets Nos. 1138 to 1151) conceals himself by finding employment on the Greyfriars staff in 1930; as does “Jimmy the One” (Magnets Nos.1247 to 1255) in 1931, and “Slim Jim” (Magnets Nos. 1660 to 1675) in 1939. In two of these cases Herbert Vernon-Smith has his suspicions – in one case he is proved right, and ends up in danger as a result; in the other case he is disastrously wrong, suspecting the undercover detective assigned to the case and befriending the real villain.