It is December in the Year of our Lord 1138 when Gervase Bonel dies after eating sauce laced with poison served which had been served with a partridge. The active ingredient found in the sauce was monkshood, poison if ingested and otherwise known as Wolfsbane. Brother Cadfael made the oil. Who used it as poison? Cadfael assesses the motives of Bonel’s Welsh natural son and his stepson, and deals with Bonel’s widow, who at one time long ago was Cadfae's sweetheart. Drawing upon his knowledge of both herbs and the human heart, Cadfael ultimately uncovers a deadly recipe for murder.
Tony Award-winning actor Derek Jacobi narrates, and his telling of this heartfelt yet sinister story brings the characters to life in this third chronicle of Brother Cadfael.