Zosia stayed after lessons in the school library during the storm. She liked the silence, the smell of the paper and the creaking chairs of the librarian lady. On the windowsill lay a card with a drawing of a windmill and a star. On the back someone had written: Don't lose the light, find the drawer. Zosia raised her eyebrows, because she had never had such a riddle before. Against the wall stood an old catalogue with brass handles. Storm rumbled as she looked at each drawer with the letter Z. In one, something rattled and a hidden spring pushed the bottom. A wooden disc with a small window in the middle emerged. The window shone like a drop of water, even though it was made of wood. Zosia called out to Igor, who was waiting for her at the door. - 'Look, it's probably part of some game,' she said uncertainly. - Or a key to something that doesn't want to be found. Igor moved the lamp over and covered its trembling light with his hand. The disc began to pulsate warmly, as if responding to the flash of the lamp. Moving silver lines appeared on the spine of the thickest book. They arranged themselves into a fan and a star, like on a card. A chill blew from the shelves and the air trembled between the volumes. - I think that's a window? - Igor pushed the books off the last shelf. Behind them a flat sheet unfolded, like water in the wind. An image flashed in the window of the disc: a bridge and a white castle. - 'If it's a portal, it only works together with this puck,' said Zosia. A bell rang from the corridor, but a different sound filled the library. Something knocked from inside, as if someone was asking to be let in. The puck suddenly clung to Zosia's hand and would not let go. The air in the taffy curled up into a vortex, ready to leap.