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Lost Gate is a Czech mystery series that premiered on Czech Television in September 2012. It is a sequel to the three-part series Ďáblova lest. It was written by Arnošt Vašíček and directed by Jiří Strach. The pair of police investigators Petr Sumara and Lenka Šímová investigate a case of a serial killer in the environment of the Prague lodge of freemasons with the help of religionist Michal Runa.