A ghost and a French marquis wander through the Winter Palace in St Petersburg, encountering scenes from many different periods of its history.
Dr. Watson executes Sherlock Holmes' will, who faced death after exposing Moriarty and his gang in the previous episode.
The protagonist finds out that some children were left behind in a sinking school, and is slowly driven mad as he tries to save them. A parable on the theme of the Last Judgment, numerous catastrophic events reveal a certain ambiguity in their origins, accompanied by the terrible suspicion that the things going on are some kind of a performance or theatrical production.
