Rico, Oskar und der Diebstahlstein (2016)

Since Rico and Oskar’s last adventure, Oskar and his father Lars have also moved into 93 Dieffenbachstraße. Another friend, the eccentric neighbor Fitzke, dies and leaves Rico his extensive stone collection, which supposedly constitutes his entire estate. Rico hears burglars in the deceased man’s empty apartment and later realizes that an important stone has been stolen. He and Oskar quickly find a lead that takes them on an impromptu trip to the Baltic Sea. There, they even tail a young gangster couple all the way to a nudist beach, only to return to Berlin without the missing stone. After an unexpected encounter with the female thief, who had actually intended to steal a truly valuable ruby, Rico reaches an agreement with her to get his stone back.