Walk With Danger — Susan Rubin

A murderer was loose in the Santa Monica neighborhood where Sharon lived. She was determined to do something about it, and came up with a plan that might prevent further tragedies. She would see to it that as many little kids as possible got to school safely. The only problem was, only a few of her friends showed any interest in helping her. Then one day she found an unexpected ally, Val DeSantis. Val was cool. He was hip. And he had his eye on Sharon. But what could they do? They were fighting an unknown enemy. Who would be the next victim?