An excellent mystery

An Excellent Mystery is a mystery novel by Ellis Peters, the third of four set in the year 1141, when so much occurred in the period known as the Anarchy. It is the 11th in the Cadfael Chronicles, published in 1985. The siege of Winchester sends monks streaming across England seeking safe haven. Two arrive at Shrewsbury Abbey. A young man seeks out the older of the two monks, wanting his approval to marry a young woman once meant for another, and she cannot be found. His quest begins.