In The Case of the Unregistered Operator, Charlie Cotelli was a cracksman who, after being released from a five year prison term at eight in the morning, committed a spectacular theft at eight the same evening. He broke into Plevington Castle and stole jewellery worth six thousand pounds but then was found in Belfast that same night. Gaskin mentioned Cotelli's case to Biggles because he believed that Cotelli must have access to aircraft in order to do that.

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