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I wouldn't recommend watching the following seasons, in case you were considering it. Better watch Yuukoku no Moriarty instead – it's a much more enjoyable creation by Moffat. Even the first season isn't perfect, and it only gets dumber and dumber from there, while the interpretation of certain characters leaves much to be desired. By the third season, everything completely spirals into trash, and the fourth... well, it's so bad that some fans, refusing to accept reality, tried to convince themselves and others that there was an existing/planned secret episode that sets everything right.