Murder of a Suicide

Edgar Prees, director of the Botanical Gardens In Asslington, is a man of such regular habits that when he is two hours late coming home one evening his daughter becomes quite alarmed. And rightly so, for Prees has, or so It seems, tried to commit suicide by trying to throw himself off a cliff. He is stopped, but the next morning, even as he still seems to be thinking about killing himself, he is murdered. Or does he kill himself?