Ulf Blanck 
The Three ???, Soccer Mania (drei Fragezeichen) [EPUB ebook] 

A soccer championship in Rocky Beach! But it´s not only about the trophy – Uncle Titus´ junkyard is at stake. The Three ??? do everything they can to save Justus´ home but their opponents are fighting with all means.
In Rocky Beach, California, live the three detectives: Justus Jonas, Peter Shaw and Bob Andrews. Together, they are The Three ??? and there is nothing they don’t take on!
The three friends witness exciting detective stories, solve puzzles no matter how tricky, and can always rely on each other.