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Cloud Cuckoo LandFifteenth century, Constantinople. Orphan Anna lives in a monastery, but secretly learns to read pagan manuscripts. Among them she comes across the story of Eton, who wants to fly to a magical city in the sky. At the same time, the Sultan's army is approaching the walls of Constantinople to lay siege to the city. Among the soldiers is the young Omer, who is considered a demon due to a birth defect.

2020, Idaho, USA. Old Zeno, trying to make children fall in love with ancient Greek literature, puts on a play in the library based on the legend of Aeton. But among the shelves lies a bomb planted by the troubled teenager Seymour.

The distant future, the interstellar ship Argos. Constance, sitting in the vault, is trying to put together the fragments of the story of Eton, which her father once told her. After all, this legend is the only thing she has left, and the only thing that will help her understand where she is headed.

Anna, Omer, Zenon, Seymour, and Constance are dreamers whose lives are intertwined through the ages thanks to a story that will change the lives of each of them.