Thomas Devilstone is on the run. The spells and charms he cast for Henry VIII have failed to produce the promised royal heir and now the king's former favourite faces a cruel and hideous death for practising witchcraft. Thomas' only hope is to flee abroad and join the desperate Yorkist rebels plotting to overthrow the Tudor tyrant, but first he must help an unfrocked priest, an unscrupulous mercenary and a deposed African prince escape from London's deepest dungeon...