In Biggles Takes It Rough, Duncan was a member of the Neville Norton gang which had set up an illegal whiskey distillery and hideout for criminals on the run on the remote Scottish island of Tola. A Scot, Duncan contributed local ground knowledge to the gang. In particular, Duncan plied the local population with free whiskey to persuade them to remain silent about what they might see or hear about the gang's operations on the island. Duncan was one of the gang members who could recognise Roderick Macaster, the owner of the island.

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