Secret Agent Brainteasers: More Than 100 Codebreaking Puzzles Inspired by Britain's Espionage Masterminds.

McKay, Sinclair.

Secret Agent Brainteasers: More Than 100 Codebreaking Puzzles Inspired by Britain's Espionage Masterminds. - 288 p.

Secret Agent Brainteasers: More Than 100 Codebreaking Puzzles Inspired by Britain's Espionage Masterminds by Sinclair McKay (2019)

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