A smokin' hot serf girl and the remains of Saint Winifred are stolen from Shrewsbury Abbey. It's up to Brother Cadfael to recover them both.
When a potter's wife suddenly passes away, the man gives up his old life to become a monk at the Abbey. Unfortunately, he is suspected by the other monks of having killled his wife so Cadfael is assigned to investigate things.
A sack is found near the Abbey and it contains the dead body of an old man who appears to have been murdered. The suspects in the crime come from a group of pilgrims that includes two known thieves.