The Soccer Kids are about to play a soccer match against Los Justos, the team from a juvenile reform school that has just opened a little outside of Little Seville. However, what impresses them the most is not that the team consists of boys and girls their age who have committed crimes, but the pirate flag flying over their field. And Los Justos have a lot in common with pirates, starting with the name of their leader: Laoi Chai San, like the famous Chinese pirate. And also their motto: I don't lie. I don't snitch. I don't trust. And most importantly: a treasure map. They just need someone outside the reform school to help them find it. But the Soccer Kids are more worried about not being expelled from the Inter-School Championship than treasure hunting, although maybe everything is related. Yet another new mystery for the Soccer Kids!