Now You See Her by James Patterson and Michael Ledwidge
Based on the information that I have received from my sister, the writer, here's how I think this went.
James Patterson had the jist of an idea for a book and he gave that info to up-and-coming writer Michael Ledwidge who wrote the book. Ledwidge may have called/emailed Patterson for suggestions about some twist or turn in the story line and Patterson would have read the story and given his final stamp of approval before it went to the editor/publisher but Ledwidge probably did most of the leg work (or finger work as the case may be).
This is a mystery/thriller that spans almost 20 years. It is the tale of a woman who found herself in an unthinkable situation. She is seemingly saved by the man who becomes her husband. She is naive and young and swallows every line he feeds her. Later she realizes this and chastises herself as she makes plans to save herself.
Years later, she must confess the truth of her past and finally reap the violence that has waited for her all these years. Whether she will survive and be able to keep the life she has built are the questions looming in her mind.