In Messina, Sicily, a French countess, Carla La Penautier, seeks passage to Malta in a quest to find the son taken from her at his birth twelve years ago. The only man with the expertise and daring to help her is a Rabelaisian soldier of fortune, arms dealer, former janissary, and strapping Saxon adventurer by the name of Mattias Tannhauser. He agrees to accompany the lady to Malta, where, amid the most spectacular siege in military history, they must try to find the boy--whose name they do not know and whose face they have never seen--and pluck him from the jaws of Holy War.