A violent past haunts Sir Walter Maltravers, the wealthy lord of Ingoldby Hall. As a commander during the War of the Roses, he fought alongside Edward IV at the bloody, fratricidal Battle of Towton. Decades earlier, and thousands of miles away, he served in the fanatical bodyguard of the last Byzantine empreror, Constantine XI Palaeologus. There, as Turkish Jannisaries breached Constantinople's walls and set the city aflame, Sir Walter committed what may have been an unforgivable sin: Instead of defending the emperor with his last drop of blood, Maltravers fled. But not before scooping up all the treasure he could carry, including the Lacrima Christi - a giant ruby said to be a holy relic of incalculable value. When the ruby disappears from Canterbury's Franciscan monastery, Sir Walter fears the emperor's vengeful loyalists - the Athanatoi - have tracked him to his estate. He doesn't have much time to ponder his dilemma. Crawling on his bare knees to the shrine at the center of his enormous private hedge maze, the penitent Sir Walter encounters his axwielding killer....