Ben is thrilled when his mom signs him up for taekwondo—especially when his best friend, Emilio, signs up too. During their first class, it becomes clear that Emilio is a natural. Ben, meanwhile, struggles to keep up. He is frustrated and embarrassed . . . until he runs into Mr. Wiz, the mysterious janitor from his school, at the studio. Mr. Wiz gives Ben a black belt, and suddenly Ben’s skills start to progress. What’s behind the sudden improvement? And will the black belt help Ben come out on top when he and Emilio face off? Or will it cost him his best friend?