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 | Don Matteo is organizing a charity auction in his parish and for this occasion approaches a wealthy woman, Mrs. Morabito, who is having marital problems. Her husband is under investigation for illegal bribes and she suspects he has a lover. The man purchased a large collector's diamond, "The Fire of Passion", from | | |
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| a wealthy noblewoman with his bribe money, intending to give it to his new lover as a gift. The man hid the diamond in a knick-knack that Mrs. Morabito unknowingly donated to Don Matteo's auction. | 
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