Kel was thrown into slavery as a child, only to be immediately rescued by the notorious pirate, Blackheart. He is grown now and flies the skies of his native world beneath keels of a material that floats when heated, trading between the scattered islands and freeing slaves whenever he finds them. A great war is brewing as the three largest islands spread their economic ideals to the Free Merchants and Independent Islands, enslaving all that resist. Kel and his crew fight slavers, hurricanes, and exploding volcanoes as he tries to live free as one of the Sky Merchants flying great winged sailing ships above treacherous seas. Then he meets the alien humans who have learned how to use another world’s unique mineral to open gates to new worlds safe from the slaver’s chains. But if you had a choice between fleeing with a few of those closest to you…or staying and fighting for the freedom of all…what would you do?