Clues does not play ball. He does not like football. Until Gianna comes and asks for his help: something suspicious is happening in her team. Clues quickly tracks down the 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 youth detective books.