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Once upon a time, the children of the German city of Hamelin left with a visiting rat-catcher and never returned to their parents. Eight hundred years later, a war breaks out in Ukraine and modern Ukrainian children meet the newest rat catcher, a retanter. And suddenly, times start to mix. Just like spaces and universes. Along with the creatures that inhabit them. And with Petryk, his sister Mariia, and Parsek the cat, who turns out to be not quite a cat. Just like rats are not rats at all.