Maja lived in the harbour under an old lighthouse on a cliff. From a young age she had a great love of riddles and sea stories. The lighthouse had been closed since a big storm years before. One afternoon in the library, she found a map with an X on it. Next to it someone had written: "The light will come back when you find the heart of the lighthouse". In the margin was a sketch of a brass ball with a small heart. Maja felt an adventure stirring in her stomach. She asked Cuba, her best friend, for help and silence. In the evening they took her grandfather's compass and set off up the cliff. The wind wheezed and the waves shimmered like fish scales. A rusty padlock hung by the lighthouse gate, hard as a rock. On the back of the map was a plan of the fog bell below the pier. Maja slid down the beams while Cuba held the rope. In a crevice she found a brass ball with a heart engraved on it. The compass suddenly stopped whirring and pointed to a gap in the rock. Behind the seaweed was a narrow wicket, almost like a secret hatch. Maja touched the tile with the same sign with her ball. Something clicked quietly and the door swung open hard. Inside it smelled of salt, rust and old lamp oil. The staircase winded upwards like a snail, cramped and dark. Somewhere above, an invisible machine purred, as if an engine was waking up. "Can you hear it?" - whispered Cuba, clutching the railing cold with salt. "As if the lantern was breathing." - replied Maja, feeling a shiver under her jacket. A cool reflection shimmered on the wall, as if from a rotating mirror. Above them, metal sounded and a brass pinion rolled. It stopped right next to Mai's shoes, reflecting the flash of her torch. Then a clear, quick step came from above them, and the light