The Bizarre Hockey Tournament — Jerry B. Jenkins

This is the sixth book in the adventures of twelve-year-old Dallas O'Neil and his Baker Street Sports Club! Have you been following Dallas and the gang as they face mysteries and puzzles? This time, the club finally raises enough money for all the expensive equipment they need to play hockey, only to enter a tournament so baffling that they can hardly concentrate on the games. The team that's supposed to win loses its first two games and is eliminated. Then Dallas is accused of cheating, just because his new young team starts winning!