As a templar, young Tristan is entrusted to protect the Holy Grail. But it is the Grail that protects him as he escapes the Holy Land - and the evil Templar Sir Hugh - and washes up, alone, on a foreign shore. Before long, Tristan's adventures put him in danger, caught in the fighting between a heretical band of Cathars and the king of France, and still on the run from Sir Hugh. Tristan's only chance to save the Grail is to make his way to England. But when he falls for Celia, the beautiful leader of the Cathars, his loyalty to the Grail wavers. And when Celia becomes endangered, Tristan is torn, forced to make a choice - and the wrong one could have disastrous consequences.