Gangs of Athol by Clark Graham
Only one week after finishing sixth grade, Billy’s summer was already doomed. He’d been kicked out of his bicycle gang, leaving him no friends to hang out with. In a small North Idaho town, what else could he do? On top of that, his mother was more secretive than ever. Billy feared she had a boyfriend. How else to explain her hushed late-night phone calls? And who was the man watching their house from across the street?