''Give me a dollar or I'll spit on you.'' That's Bradley Chalker for you. He is the oldest child in the class. He tells enormous lies. He picks fights with girls, and the teachers say he has ''serious behaviour problems.'' No one likes him - except Carla, the new school counsellor. She thinks Bradley is sensitive and generous, and she even enjoys his far-fetched stories. Carla knows that Bradley could change, if only he weren't afraid to try. Sometimes the hardest thing in the world is believing in yourself.