Cadfael's novice, Brother Oswin, is found close to death, babbling about a woman. When a nun is found raped, murdered and encased in the ice of a frozen stream, Oswin is accused of murder. Cadfael tracks the nun's companion, Ermina Hugonin, and sets out to prove Oswin's innocence.

• Edith Pargeter

• Natascha McElhone
• Toby Jones
• Julian Glover