In the third book, various mystical enchantments and spells keep the citizens of Paradys in madness, lust, and sorrow. But in the fourth book, few know the true secret behind Paradys the City -- that it is not one world, but three cities bound together by a labyrinth of ice and its inhabitants knowing it differently: Paradise, Paradis, and Paradys. Then two twins from Paradise stumble upon two mental institution patients from Paradis and Paradys.