Unterricht und Didaktik: Moderne SprachenKosmos × The Three Investigators and the Mystery of the Vanishing TreasureAmerican EnglishRobert ArthurKosmos 2015 The Three Investigators and the Mystery of the Laughing ShadowAmerican EnglishWiliam ArdenKosmos 2015 The Three Investigators and the Secret of the Crooked CatAmerican EnglishWiliam ArdenKosmos 2015 The Three Investigators and the Mystery of the Stuttering ParrotAmerican EnglishRobert ArthurKosmos 2015 The Three Investigators and the Mystery of the Coughing DragonAmerican EnglishNick WestKosmos 2015 The Three Investigators and the Secret of Terror CastleAmerican EnglishRobert ArthurKosmos 2015 The Three Investigators and The Mystery of the Whispering MummyAmerican EnglishRobert ArthurKosmos 2015 The Three Investigators and the Mystery of the Fiery EyeAmerican EnglishRobert ArthurKosmos 2015 The Three Investigators and the Mystery of the Screaming ClockAmerican EnglishRobert ArthurKosmos 2015 The Three Investigators and the Mystery of the Talking SkullAmerican EnglishRobert ArthurKosmos 2015