When the diamond on Miss Mackles engagement ring disappears, the kids in Room 3B are determined to help her find it—especially Harry. The third grade talent show is coming up, and he wants to show off his skills as South Schools greatest detective. Meanwhile, Doug has no idea what to do for his act. He cant sing like Dexter, or dance like Ida, or solve mysteries like Harry. Now the best friends have to find both Dougs talent and the teachers diamond, or else the talent show will be a horrible disaster for everyone!,
