In The Case of the Unregistered Operator, Joe Lasker was a smash-and-grab specialist. He robbed a Bond Street jeweller of a tray of rings worth eight thousand pounds and was identified by a policeman on duty. However two hours later, he was seen in Montparnesse. Gaskin mentioned Lasker's case to Biggles because he believed that he must have access to aircraft in order to do that.

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