How does Mitch stop the gang in the book payback time by Carl Dueker?

In "Payback Time" by Carl Deuker, Mitch stops the gang by using his investigative skills and courage to gather evidence against them. He uncovers their illegal activities and exposes them, ultimately leading to their downfall. Mitch's determination to seek justice for his friend drives him to confront the gang, showcasing his growth and commitment to doing what's right.