The Lost Islands of Alabaz by Michael Gentry

Once upon a time, our Kingdom was much larger than it is now, reaching across all ten islands of the Alabaz Archipelago. But then a terrible curse fell upon us. A thick, gray mist covered the sea, hiding each island from the others, cutting us off from our neighbors. Every ship that ventures into the mist becomes lost. No one knows where the other islands are or what has happened to the people there. For years we have studied the mist, hoping to discover some way to break the curse. We had almost given up hope. But now, we have discovered a secret that could solve the mystery of the mist once and for all. And we are giving that secret to you...