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Brother Cadfael and his fellow 12th Century holy men at Shrewsbury Abbey return in this mystery based on the novel by Ellis Peters. The festivities of the annual Shrewsbury Fair are spoiled when a travelling merchant is murdered; his harsh personality earned him few friends among the local salespeople, but Brother Cadfael (Derek Jacobi) believes something more serious than an argument gone too far is involved -- especially after another merchant is killed. A young woman's life is put in danger by the crimes, and she's brought to the Abbey for her own safety; however, she's kidnapped shortly after the key suspect dies while trying to escape questioning. As Cadfael and his brothers attempt to find the girl, the former soldier finds himself challenged to a battle with swords by the man responsible for the killings. Brother Cadfael: St. Peter's Fair was produced for British television and first aired in America on the PBS series Mystery!.