Dead Man's Ransom

_Discover Brother Cadfael: Former soldier. Benedictine monk. Amateur sleuth.
_
The Cadfael Chronicles, by Diamond Dagger winner Ellis Peters, follow the mediaeval mysteries of one of classic crime's most unique detectives.

In the battle of Lincoln, 1141, the Sheriff of Shropshire is captured by the Welsh forces of the Empress Maud. The county proposes to exchange him for a young Welsh nobleman. But when the Sheriff is murdered only Brother Cadfael can save the captive from retaliation.