Puzzles for Spies: The brand-new puzzle book from GCHQ, with a foreword from the Prince and Princess of Wales

{"main_aff_id":"oxfordinsti00-21","aff_ids":[{"country":"com","aff_id":"oxfordinsti00-21"},{"country":"co.uk","aff_id":"oxfordinsti00-21"},{"country":"de","aff_id":"oxfordinsti00-21"},{"country":"fr","aff_id":"oxfordinsti00-21"},{"country":"co.jp","aff_id":"oxfordinsti00-21"},{"country":"ca","aff_id":"oxfordinsti00-21"},{"country":"it","aff_id":"oxfordinsti00-21"},{"country":"es","aff_id":"oxfordinsti00-21"},{"country":"com.br","aff_id":"oxfordinsti00-21"},{"country":"com.au","aff_id":"oxfordinsti00-21"},{"country":"nl","aff_id":"oxfordinsti00-21"}]}