When Amelka first heard about the Forest of Shadows, she was nine years old. Now, at fourteen, she knew that no resident of their town dared to go deeper than a stone's throw away. The forest was dense, the paths twisted and the damp air full of whispers that adults were not allowed to repeat. But Amelka was not alone that night. Next to her walked Janek - a perpetually dishevelled boy with a talent for breaking bans - and Lena, whose curiosity could pierce the hardest silence. All three hid under the shady branches, ready to take a step further than everyone else. The reason was simple: last Wednesday, just after dusk, Lena found a shiny shard of glass in her garden with a strange symbol engraved on it - a trident pierced by lightning. They whispered about it for hours. Amelka's grandfather used to say that there used to be a town behind the old forest that could disappear in the sunlight and only reappear when the moon was full. Except that no one believed it. Nobody, except Amelka, Janek and Lena. Dry branches crackled underfoot. They plunged deeper and deeper into the huge ferns and glossy lichens, as if the forest wanted to swallow them. Suddenly, from behind a thick curtain of leaves, a light flashed. Unlike campfires or torches, this light shimmered with hundreds of colours - as if the air had cracked open and revealed something that no one but them had a right to know about. For a moment they were silent, as if afraid to speak. Lena squeezed a piece of glass that, for some unknown reason, began to pulsate slightly. - Can you see it? - whispered Janek, squinting his eyes. Just in front of them, behind a tangle of bushes, stretched a deep clearing, and on it - shimmering glass towers, fine bridges made of ice crystal and tall gates, on which flickered flames that were probably fire, or perhaps something even more unusual. Transparent streets wound around columns and fountains, in the middle of which floated beings composed of light and mist. Amelka felt her heart pounding in her chest. This couldn't be real... Suddenly, somewhere in the depths of the city, there was a penetrating sound, like the ringing of a bell, and everything around her lit up even more intensely. Lena dropped the glass, which floated in the air of its own accord, spinning around its own axis. At the same moment, a figure emerged from one of the gates - tall, wrapped in a cloak woven of mist and lightning. The gaze of her eyes stopped on the three friends. Before they had time to do anything, the light exploded with a thousand sparks and the clearing began to shake, as if something enormous was about to happen....