Before the Civil War, a slavemaster named Jonah takes his family and five of what he believes are his most loyal and trustworthy slaves to a remote and beautiful island off the coast of Florida.

But as soon they arrive, one of the slaves named Shaka lures the other slaves into his Shamanic and animistic beliefs. When a pair of black, inverted wings appear on the island from nowhere, the slaves come into conflict with Jonah and soon revolt altogether.

As Jonah strives to repress the rebellion and his wife, Eloise, strives to reconvert the slaves back to Christianity, the slaves delve...