A healing remedy or a deadly poison? Owen Archer confronts a lethal mix of dangerous attraction and troubling secrets when two knights die unexpectedly.

York, 1363. Master apothecary Nicholas Wilton provides a healing potion for a wounded soldier at St Mary's Abbey.

A KILLER CURE?

When Brother Wulfstan administers the special physick to the pilgrim and a fellow knight, tragedy strikes. Is the poisonous potion an accident, or a deliberate act of murder? Owen is sent to investigate by the Archbishop of York, disguised as an apothecary apprentice assisting Wilton's wife, Lucie.

THE SINS OF A KNIGHT

He soon learns that the first victim, Sir Geoffrey Montaigne, travelled to York to atone a past sin, and had crossed paths with Nicholas before. What was the knight's past misdeed, and what is his connection to the apothecary?

IS FORBIDDEN LOVE A DEADLY DRUG?

Owen uncovers troubling links between the knight and others close to Nicholas - including Lucie, who has captured his heart. But is he falling in love with a killer?