Olive had always liked old things. Rummaging in her grandmother's attic was her favourite pastime, even if the dust tickled her nose. But that afternoon a surprise was waiting for her. Her brother, Tom, did not feel like accompanying her at first. Instead, he wanted to play games on his phone. However, when Olive pushed aside the heavy trunk and discovered a huge mirror decorated with strange signs, he immediately forgot about electronic entertainment. - Look, there's an inscription here! - whispered Olive, pointing to the design on the frame. The letters were bent, almost invisible. - It looks like a code to be broken! Tom pressed his nose almost to the glass and immediately stepped back in amazement. - I swear, I saw a shadow there... But here is only our reflection. - he said, bawling his eyes out. Olive ran her finger across the smooth surface. The reflection began to shimmer with colours, as if someone had stirred up the water. - Do it again! - Tom asked. When Olive touched the glass a second time, the mirror suddenly trembled and their faces disappeared from it. Instead they saw a strange landscape: the trees looked like spreading umbrellas and the sky had a green hue. A quiet whisper came from inside the mirror - as if the leaves were trembling in the wind, although the room was completely silent. - 'Do you think it's possible to go in there? - Tom asked in a whisper, squeezing Olive's hand. Suddenly, a slender figure in a cloak appeared in the taffrail, its eyes shining with a golden glow. She pointed at her siblings and then at a mysterious gate in the green forest. The mirror shone with a blinding light. The siblings looked at each other, feeling that at this exact moment they had to make a decision....