When you're seven centimeters tall, a messy attic can offer a world of mystery and wonder! Zip and his friend Wheel explore the shadowy corners of a long-forgotten children's room, playing with wooden blocks, wind-up toys, toy soldiers, and surprise boxes. But a family of mice interprets their noisy presence as an invasion and fights back. Zip and Wheel retreat to a dusty music room, where more creatures and an unexpected symphony emerge from the woodwork!