One by one members of the Montgomery family have died in tragic accidents. Photographer Sarah Montgomery is the last surviving member of the aeronautics dynasty. After the death of her beloved grandfather, she accepts the fact that her husband never loved her and initiates divorce proceeding. On the way home from the lawyer's office, Sarah is hit by a cab. Days later she awakens in the hospital and has no idea who she is. Industrialist Trent Caldwell harbors guilt over his wife's death. A passenger in the cab that struck Sarah, he now feels responsible for her injuries. When no one steps forth to identify the woman in the hospital, he arranges for Mrs. Kearn, his housekeeper, to care for her in his home. Seeing in Sarah someone who just might draw Trent out of the darkness he's succumbed to since his wife's death, Mrs. Kearn sets about playing matchmaker. But the Montgomery family deaths weren't accidents. Someone harbors a deadly secret and using skills perfected as a youthful IRA operative, has systematically eliminated the family out of a need for revenge. Realizing Sarah's true identity, the assassin now has one more kill to make in order to fulfill a promise made long ago.