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Professor Layton, Luke and Espella first meet Ridelle at the Great Archive, where they ask her about the Grand Grimoire. She tells them that the book is in a special viewing room, and that only highly intelligent people may view it. The professor then shows his skills by solving both of her puzzles, leaving her shocked. Ridelle then accompanies Layton and co. to the special viewing room with the Grand Grimoire.
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.