Such nice people

Tom Nash, president of the senior class, captain of the basketball team. Life was opening its arms before him, but Tom could think only of death. As Christmas drew closer and his relatives made their holiday plans, Tom, tormented by voices in his head, made his own plans—to murder his whole family. Only Kit, his favorite sister, could be allowed to live. All the others would perish. That was the way it had to be. As Tom raced toward his destiny, each member of the Nash family became aware that something was terribly wrong—though nobody was quite sure what to do about it. Everything would be better after the holidays, they thought. If they make it through the holidays alive...