The rain drummed against the windows of the city library and the corridors were silent. Eleven-year-old Antek was waiting for his dad, who was late again. Mrs Rose was sorting books, but suddenly disappeared between the bookcases. Antek looked at the stairs leading to the door with the sign. "Warehouse. No admittance," the sign proclaimed, crooked and dusty. A quiet clang came from above, as if a small bell had been moved. "Hello?" he asked, although he couldn't see anyone in the semi-darkness. On the windowsill lay a narrow blue book without a title. When he opened it, the pages rustled and turned into a map. A map of the library, but with a corridor that wasn't here. A dot flashed in the middle, like a button on a lift. The dot moved deeper, beyond the wall with the geography section. "Is this some kind of joke?" he muttered, but curiosity pulled him further in. A light bulb dangled from the ceiling and flicked on, like the eye of a secret door. A map led to a bookcase where atlases and dust stood. A spiral symbol flashed between the volumes, thin as a pencil line. Antek pressed the spiral, and something clicked under the wood. The bookshelf twitched, moved apart a little, and he smelt the cool smell of leaves. Somewhere far away a train wheezed, though the tracks ended at the market. "Antek?" cried Mrs Rose, her voice sounding quieter and quieter. The words appeared on the map: "Entrance open. You have one minute." The air behind the ledge was dark, but it shimmered like water. Antek slid his hand into the crack, feeling the cold like snow. In the hall, the clock struck for the first time.