Without more information about the episode, it's hard to say exactly what the story is. It could range from a fictional tale Roz made up on the spot to a real - life adventure she had. It might also be a story with a moral, like how being honest always pays off or something similar.
I'm not sure specifically as there are many episodes of Frasier. It could be a humorous anecdote, a personal experience, or something related to their work at the radio station. Without more context about the particular episode, it's hard to say exactly.
The 'Mystere Joconde Secret Story' might be a story full of enigma. It could be about a discovery related to the Mona Lisa. For example, it could be about a hidden message that was found within the painting through some new analysis techniques. Or perhaps it's a story about a person who had a special connection to the Mona Lisa and their untold experiences.
There's no information indicating who created the 'Mystere Joconde Secret Story'. It might be the work of a researcher who has delved deep into the mysteries of the Mona Lisa. It could also be a creative writer who was inspired by the allure and mystery of the famous painting.
He might be surprised. If Roz tells a story full of unexpected twists, Martin could show his astonishment through his facial expressions or some short exclamations.
There is also a fan fiction titled 'Mystere: The Untold Tales'. This one often focuses on the more mysterious and unexplored aspects of the Mystere universe. It might introduce new characters that fit well within the existing lore, adding more depth to the story. For example, it could be about a secret society within the Mystere world that has been hidden all this time.
One unique feature could be the mystery aspect in the love stories. It might keep readers guessing about the relationships, motives, or outcomes. Maybe it also has vivid descriptions that are like a 'coloriage' - painting a colorful picture of the love tales in the readers' minds.