In the February of the year of our Lord 1141 men march home from war to Shrewsbury but the captured Sheriff Gilbert Prestcote is not among them. Elis a young Welsh prisoner is & he is delivered to the Abbey of Saint Peter & Saint Paul to begin a tale that will test Brother Cadfael's sense of justice.. .and his heart. By good fortune it seems the prisoner can be exchanged as Sheriff Prestcote's ransom. What none expects is that good-natured Elis will be struck down by Cupid's arrow. The sherrif's own daughter holds him in thrall & she too is blind with passion. Now regaining her father means losing her lover. But then the sheriff ailing & frail is brought to the abbey's infirmary & murdered there. Suspicion falls on the prisoner who only has his Welsh honour to gain Brother Cadfael's help. & Cadfael gives it not knowing the truth will be a trial for his own soul.