Ola always wondered why her pencils disappeared so often, her eraser suddenly appeared, and her ruler sometimes mysteriously landed in someone else's backpack. But one evening, she was left cleaning up the room after art class, when she heard a quiet whispering from under the bench. - Don't move! She's still here! - whispered someone in a thin voice. - Shh, or she'll hear us! Ola looked around, but there was no one in the room. She was about to bend down to pick up her crayons, but then she heard a distinct stamping. She looked under the bench and.... she couldn't believe her eyes. Her own pencil case was standing proudly in the middle and... smiling at her! A brown-striped pencil peeked out from the lock, and next to it appeared an eraser with a pink hat and a ruler that swayed as if from impatience. - 'Ola, we've finally found you! - said the pencil case. - You've been waiting for this day almost all through primary school, haven't you? The girl blinked, thinking that maybe it was a dream after all. But everything seemed too real. Even the twisted sharpener jumped up merrily and the crayons spread out in a colourful fan. - 'You're the only person who can help us,' said the pencil mysteriously. - 'There's been a secret hiding in the school cellar for years that only we know about...' The ruler looked at Ola with serious eyes. - But beware, Ola. What we find there could change your life forever. At that moment, a sudden crack sounded in the corridor. Someone was approaching the hall door. All the paraphernalia immediately froze, and Ola felt her heart beating like crazy.... Should she trust her utensils and go with them to the mysterious cellar? And who was this someone who had just entered the school after dark?