The Hummelsdorf Football Club was on the verge of winning an important match when the opposing team committed a flagrant foul, allowing them to score the winning goal. Why didn't the referee stop the game? Could he have been bribed? While the fans are outraged, the members of the Black Paw Detective Agency begin an investigation. Would you like to join the team of four young detectives?
Then collect all the books in this exciting series!
