Trace. Who killed Maria James

The whole place seems cold, and he feels a terrible sense of dread. He calls out, but gets no reply. Taking a knife from the cutlery drawer, he unlocks the back door as an escape route. Then he sees her on the floor. Her eyes and mouth are open, and there is blood everywhere. He's too late.After a strange phone call with his ex-wife, John James had sensed something was wrong and raced over to her house. As he stood in her bedroom doorway, transfixed by the sight of her body, the killer was almos