Redbeard is in Tortuga, once a free haven for pirates, now a French colony. Here he hopes to find his old nemesis Morgan's hidden treasure. His only clue is a name-Mami Wata. But Mami Wata is a Vodou goddess, the Mother of Waters. The Europeans on the island know nothing of her, and the slaves, who worship and fear her, won't talk. The pirate captain is forced to look for the goddess's priest… but can he trust him?
