Worcester, January 1145. Poison strikes down bow maker Godfrey Bowyer and his wife Blanche after their evening meal. While she survives, he dies an agonising death. Few could have administered the poison, which should mean a very short investigation for the Sheriff's men, Hugh Bradecote, Serjeant Catchpoll and Underserjeant Walkelin. But perhaps someone was pulling the strings, and that widens the net considerably. With an unpopular victim, the suspects are many and varied.