Overview: Dr Thorndyke has to decypher a code to stop a plot to assassinate a Russian Grand Duke.
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First Air Date: Sep 20, 1971Last Air date: May 07, 1973Season: 2 SeasonEpisode: 26 EpisodeRuntime: 50 minutesQuality: HDIMDb: 7.30 / 10 by 9 usersPopularity: 23.583Language: English