One of the bizarre Icarus La Plume’s flying vehicles takes Zagor and Cico in a city built on top of a hill, separated from the world by a curtain of poisonous gas. Ol Undas is inhabited by the heirs of a forgotten and very advanced civilization. But now strange events shake the tranquility of the peaceful inhabitants of Ol Undas: monstrous creatures roam the city and create suffering. Zagor's up to discover who’s behind them.
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