Nobita says that Deluxe, one of the most famous gadget robbers from the future, where Doraemon lives, must had done it. When he returned home, Nobita discovers that Doraemon's cat bell is not in Doraemon's neck.
The movie starts with two robbers stealing a sculpture, but then, Nobita appears as Sherlock Holmes and defeats the robbers, but it was just a dream from Nobita while he was sleeping in school. It is the 33rd film of the Doraemon film series. Doraemon: Nobita's Secret Gadget Museum ( ドラえもん のび太のひみつ道具博物館（ミュージアム）, Doraemon: Nobita no Himitsu Dōgu Museum), also known as Doraemon and Nobita Holmes in the Mysterious Museum of the Future and Doraemon the Movie: Nobita in the Secret Gadget Museum, is a 2013 Japanese anime science-fiction mystery comedy film.
