Diamond In The Rough — Joyce McGill

At the ripe old age of sixteen, Blair has finished high school a semester early and is waiting to start college in the fall. In the meantime, her
friendship with the street people in her neighborhood leads her into a mystery involving missing persons and stolen jewels. What has Blair stumbled into? Whatever it is, it's okay, because she's smart and resourceful and knows how to track down a clue or two. Besides, she meets Tim, a diamond in the rough whose definitely worth investigating.