The victim whom Mario Ilari is falsely accused of killing. She was kidnapped by the actual murderer, and her body is eventually discovered, which clears Mario's name and resolves the central conflict of the story.
Mario and Greta had a prior acquaintance arranged for travel purposes before her death.
Calì places himself at the location where Greta was ultimately killed.
Luisa's actions are indirectly driven by the need to resolve Greta's tragic fate.
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