Ridelle Mystere is a librarian appearing in Professor Layton vs. Phoenix Wright: Ace Attorney. She is the curator of the Great Archive in Labyrinthia. She replaces Granny Riddleton, Keats, Beasly and Puzzlette as the puzzle keeper.
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After opening the secret basement of the Great Archive, Ridelle tells Professor Layton and Luke about the Legendary Fire, an event in the past caused by the Great Witch Bezella.
- Her name is a pun on the words "Mysterious Riddle".
- Her German name seems to be a combination of the German word for puzzle (Rätsel) and "Gretel" from the fairy tale Hansel and Gretel (which originated in Germany under the name Hänsel und Gretel)