From Wikipedia: Unleavened Bread is a 1900 novel by American writer Robert Grant, which is said to be an example of the problem-novel. The selfish wife of a businessman forces her way into upper society.

I'll be posting the following ten best selling fiction books in the U.S. for the year 1900:

1. To Have and To Hold, Mary Johnston
2. Red Pottage, Mary Cholmondeley
3. Unleavened Bread, Robert Grant
4. The Reign of Law, James Lane Allen
5. Eben Holden, Irving Bacheller
6. Janice Meredith, Paul Leicester Ford
7. The Redemption of David Corson, Charles Frederic Goss
8. Richard Carvel, Winston Churchill
9. When Knighthood Was in Flower, Charles Major
10. Alice of Old Vincennes, Maurice Thompson