Galileo, as its residents claim, is an ordinary flat planet flying somewhere into the abyss of space. Today, it celebrates Seed Day. Liliann, Yarik, and Max must pass the Trials this year, which will prove that young people can begin full-fledged adult life. The morning sun popping out from beyond the Edge fills them with hope that everything will turn out as best as possible. During the tests—what the residents of Galileo call the Trials— the kids meet a mysterious girl named Endji. Liliann, who has spent the rest of her life seeing Yarik by her side, starts to feel jealous of the groom’s new girlfriend, a girl who seems to have appeared from nowhere—and, to top it off, the girl casually announces that Galileo isn’t even a planet. Will the kids manage to pass the Trials? Who is Endji? And what’s wrong with Galileo? Find out in the book!