The Idea Factor - Wife to Order
The book starts out with the main character waking up. They have no memory of their life leading up to that point. By their side is their husband, who is wealthy and loving. All through the first half of the book, she is reintroduce to her life. However, halfway through, it's revealed that it was never her life to begin with. It starts with another wife in the same position and she starts to investigate. In the end, it's revealed that there is a company that abducts women, erasing their memories and selling them to their new husbands.