A Ilha dos Escravos.

After a violent civil war, D. Miguel, the last Portuguese absolutist king, is defeated by the liberals, led by his brother D. Pedro. In 1834 D. Miguel left for exile. His supporters don't give up on returning him to the throne. Willing to do anything they even try to use the slaves of the colonies. A mysterious emissary is sent to Cape Verde to prepare an uprising. But other reasons were behind his visit to the archipelago ....