From the back cover:
"Serena Carmichael had knowledge. Knowledge of herself - who she was, what she had, where she was going. Her most precious possession was her family - Louise, Harry and Stephen, her husband.
The police thought she knew everything - a woman in so much control of her life must know her husband's whereabouts.
Her friends can't believe she didn't know. Which makes her a dangerous person to have around.
Her daughter only knows that Serena doesn't understand her; her son isn't old enough to know much of anything yet.
Which leaves Serena very much alone. The only thing she knows for certain - can hold on to - is that Stephen loves her. Doesn't he?"