The snake-stone

"James is a championship diver, with a shot for the Olympics. But when he thinks about his birth mother, something in him sinks like a stone. His adoptive parents love him, and his father is a terrific diving coach--yet even they cannot tell him who he really is. So James breaks training and runs off to the farmland of his birth, with nothing but a mysterious stone shaped like a snake. Can he use it to unlock his past?"