A gang of city children is secretly practicing to enter a musical competition. All of them plunder their parents' supplies in order to build their own stage and amplifiers. Baffled by these unexplained thefts, the parents decide to hold a meeting as their suspicions turn to a group of camper folks living across from their flat. The tables are turned when the residents take a camping holiday of their own and end up being mistrusted by the locals as much as they themselves did their own neighbors. Meanwhile, the children's gang meets a rival group of kids who are planning to enter the same competition.
One day, as Senior wanders aimlessly through the city, his attention is drawn to demolition workers tearing down an old building. Among the rubble, Senior discovers an old model ship. He takes it home and begins studying old ship logs and nautical charts. Thomas also shows interest, and before he knows it, he finds himself embarking on a new adventure with his friends and Senior.
