The City of Sparks was large, full of neon lights, misty streets and surprising nooks and crannies that could conceal the craziest ideas of its inhabitants. Most of the time, the city was bustling with ordinariness: the cafés were filled with students preparing for their exams, the trams hummed among the tall buildings, and in the parks, even in the evenings, clusters of people gathered to chat half the night about everything and nothing. Among all these people were three people who had known each other since childhood: Lena, Bartek and Karol. Despite the fact that they were already nineteen years old and had not been children for a long time, they still spent their evenings together, meeting in the same café where, years ago, they had planned their greatest "missions" - from building huts to escaping to the rooftops of tenement houses at night to admire the city lights. One evening, when the air was thick with an approaching storm, Lena noticed something unusual. Walking to the café, she passed an underpass under the station. The walls were covered with the graffiti she usually saw every day, but today something had changed. One of the drawings - depicting the silhouette of a man with outstretched wings - pulsed with a soft blue light. Lena stopped, touched the wall and, for a moment, it felt as if millions of sparks flowed through her hand. Before she realised what was happening, she saw two boys: they were Bartek and Karol, who had just come down the stairs. - Did you guys see that? - whispered Lena, pointing at the shimmering figure. Karol pulled out his phone to take a picture, but the screen flickered, blurring the image. Bartek instead swiped his finger across the glowing graffiti. In an instant, the world around them swirled and his hand suddenly became almost transparent. For a few seconds he flashed across the wall! - What was that! - he exclaimed, panting heavily as if he had run a marathon. Lena looked at her hand. It glowed gently, as if it was glowing from within. Charles, initially sceptical, tried to touch another part of the mural - he felt a strange chill, and a moment later his thoughts seemed to sharpen, he could even hear barely audible conversations coming from the platform above them. His friends stood looking at each other in silence, the neon light reflected in their eyes. Suddenly, in the distance, at the end of the walkway, there was the clatter of heavy boots. A man in a long coat stepped out of the shadows, who seemed to know well where he was going. He stopped, looked at them and raised a hand in which a blue spark flashed. - I have been looking for you," he said in a voice that pierced the air like lightning. The friends did not yet know what to do, but they felt that the world they had known until then was about to change....