Angel Snare (The Joslin De Lay Mysteries 5), by Dennis Hamley

Joslin is a young French minstrel, travelling across England to Wales in order to discover the truth about his long-lost mother. However, like Brother Cadfael, gruesome murders seem to seek him out in every town he visits.

In Angel’s Snare, the fifth book in the series, Joslin has reached Hereford – just over the border from Wales. His quest may be nearly over – but a beautiful young nun has fallen to her death from the top of Hereford’s half-finished cathedral tower. It’s a mystery that Joslin can’t ignore – for the nun is Christina, sister of his travelling companion Crispin…