Time bomb.

The cheerful chaos of a California schoolyard is shattered one autumn day by gunfire. No children are hurt, but a sniper is shot down -- and psychologist Dr Alex Delaware is called in to help the kids cope with the trauma. Then comes another stunning surprise: the identity of the sniper. Delaware is intrigued by the chance to explore intimately the forces that created such a twisted personality. But as he becomes more deeply involved, he discovers an ever-widening net of malice has been cast -- one that reaches far beyond the school compound, and which may already have claimed innocent lives.