When Marion Hemming accepts an invitation to spend the Christmas holidays in Switzerland with an old classmate from her boarding school days, she's on the brink of doubting her marriage. She never suspects that the seemingly innocent invitation is part of her husband's plan to involve her in a bitter power struggle which includes unanticipated treachery and leads her into uncertain partnerships and liasons. From a luxurious, forboding house in the Swiss mountains to London's room eleven on the eleventh floor of a hotel, A Dangerous Weakness catches Marion up in a breathless chase which brings her full-circle to the realities of love and one woman's strength.