Klooz doesn't play soccer. He doesn't like soccer. Until Gianna comes and asks for his help: something suspicious is happening in her team. Klooz soon finds himself on the trail of three suspects. But to solve the case, he will have to wear the goalkeeper's jersey himself...

An exciting series for young readers, featuring a nine-year-old boy who has nothing to envy from the heroes of classic detective novels.

The series was awarded the Hansjorg-Martin-Preis in 2006, the most important German award for authors of children's and young adult detective books.