The Soccer Squad is about to play a soccer match against Los Hustos, the team of a juvenile reform institution that just opened near Little Seville. However, what impresses them most is not that the team consists of boys and girls their age who have committed crimes, but the pirate flag waving above their field. And Los Hustos have a lot in common with pirates, starting with their leader's name: Laoi Tsai Shan, 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 from outside the institution to help them find it. But the Soccer Squad is more worried about not being expelled from the Inter-School Championship than about treasure hunting, although perhaps everything is related.
Yet another new mystery for the Soccer Squad!