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| Don Matteo becomes personally interested in a lawsuit regarding the death of Grandma Elide's husband. As the priest enters the office of the defending lawyer, someone fires a gun. In the ensuing struggle, Don Matteo finds the weapon in his own hand, but the masked killer escapes. The lawyer lies dead at Don Matteo's feet. The police are forced to |  | |
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| arrest the priest since he was holding the weapon. Don Matteo risks life imprisonment. In jail he meets other convicts and learns of the relationship between his lawyer and the deceased attorney. | | |
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