"Domingos Fernandes Calabar started out as a military advisor for the Portuguese in Brazil. But to his superiors, he was still nothing more than a mameluco, a man of mixed blood. Until, that is, the Dutch arrived and he switched sides. Then the Portuguese had a new label for him: 'traitorous dog.' But when Dutch admiral Maarten Tromp arrives, having barely survived the disastrous Battle of Dunkirk, Calabar's job changes again. Now he has to help engineer...