A Counterfeit Betrothal by Mary Balogh
A Counterfeit Betrothal
Signet Regency, 1992, ISBN 0-451-17256-6
The Earl and Countess of Clifton parted bitterly and have lived separately for many years. But now their daughter has contracted an ineligible engagement, and they are brought together in a mutual attempt to save her from unhappiness. What they do not realize is that Sophia has staged the counterfeit betrothal with Lord Francis Sutton with the deliberate purpose of reconciling her parents.
Anyone read this? Yes I am such a bookwhore, I don't even read trad's and I buy Mary Balogh whenever I find them.
What? It was 1.00! And I will read it some day 
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Good find! I read it and still have it. It's pretty good as I recall. I always buy Balogh whenever I find them too even if I already have it. It's probably worth about $20.
There's no telling if I've read it or not. I used to scarf those things! And I buy them too--God knows why