At dawn on Easter morning 1343, a marauding band of French raiders arrives by boat to ambush the coastal village of Hookton. To brave young Thomas, the only survivor, the horror of the attack is epitomized by the casual savagery of a particular black-clad knight. Thomas vows to avenge the murder of his townsmen and recapture a holy treasure that the black knight stole from the church. But Thomas must first make his way to France, so he joins the army of King Edward III as it is about to invade the continent and quickly becomes recognized as one of England's most deadly archers.
When Thomas saves a young Frenchwoman from a bloodthirsty crowd, her father rewards his bravery by joining him in the hunt for the mysterious dark knight and the stolen holy relic. What begins as a search for vengance will soon prove the beginning of an even higher purpose: the quest for the Holy Grail itself.