The Assisi Murders (1985)

An Italian historical murder mystery.
"Bullied by his redoubtable sister into accompanying her on a 'pilgrimage' to Assissi, Commissario Achille Peroni, 'the Rudolf Valentino of the Italian police', finds himself lusting after a fellow pilgrim, the beautiful and mysterious Signora Elisa Guidi. But before he can make his advances, the lady is behind bars on a charge of shooting her lover.
Peroni leaps to the defence. His independent investigation leads him back to a complex thirteenth-century mystery and to the letters of a remarkable woman, a confidante of St Francis himself. Perplexing antique evidence casts new light on the crime before Peroni..." - Time Warner jacket notes (1988).
Interesting background, improbable plot, entertaining but silly. ( )