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Kate is an ordinary 11-year-old girl. She has a brother, Tom, and a mysterious uncle, Herbert, whom they have never met. But one day, on her birthday, Kate receives an unexpected gift from her uncle: a magical train called the Silver Arrow. And since then, fantastic events have been happening in the lives of Kate and Tom. Because the children go on a journey. And the Silver Arrow is rushing them to the world of adventure. An extraordinary train takes children to distant lands, stopping from time to time at magical railway stations. They find themselves in a place where exotic animals live, which, it turns out, can talk. Places Kate and Tom have never been, not even in their dreams. Adventures and the unknown await the brother and sister, which excites and beckons. And this journey is also an opportunity to save the whole world.