As the library closed the blinds, the storm rattled the windows like keys. Iga, the fourteen-year-old helper of her librarian aunt, was collecting notebooks and headphones from the tables. At the end of the corridor, behind a door with milky glass, a special room waited. A Map of the Sky exhibition and an old, dusty-smelling card catalogue were set up inside. Leon, Iga's school neighbour, had brought a pizza and a torch with interchangeable filters. They were to clean up, look at the stars in the inflatable planetarium and be back by ten o'clock. The lights went out as thunder rolled like a trolley down a long ramp. Leon's torch reflected in the glass of the display case, and something buzzed quietly. One of the cards slid out on its own, as if someone had pulled it from underneath. On the back, the ink spilled out in a perfect circle, as dark as a deep lake. The circle rippled, though the air stood still, heavy as a rain blanket. Beneath the circle lay a thin volume with the title Atlas of Passages, clipped together with a metal clip. Iga opened the book and the paperclip popped off and stuck to the page. The lettering flicked on, forming an arrow and the words: Tilt towards north, safe angle four. Leon placed the compass from the key ring and the needle stood north as if glued. As Iga tilted the card, the inked circle floated down, growing like a bubble. Rocks and a milky river flashed in the centre, flowing against gravity. Iga dropped the pencil; it hovered in the portal, turned, came back cold as ice. The sound of keys came from the corridor; her aunt was trying to open the door of the special room. At the same moment the circle widened until it touched the frame of the catalogue. On the other side someone knocked, but it sounded like creaking skis on ice. - Hello? - whispered Leon, and the echo answered with Iga's voice, only a second later. The air darkened, the paper hissed, and the compass turned south on its own. The door from the corridor creaked, the key clicked in the lock, and something moved its lips in the portal. Iga squeezed Leon's hand, tilted the card up one step and gasped for air. An inked hand slid out from inside, touched a pencil and the light went out.