The book does have an overall romantic plot line that is reminiscent of Pride and Prejudice but the gender roles are reversed. The male protagonist Kol is a bit "prejudiced" like Lizzie and the female character Mya is arrogant and proud like Mr. Darcy. However, the book also has another unique plot line that has nothing to do with Pride and Prejudice. It is Mya's backstory and how it affects the present and future events. It is a story of two clans and animosity between them. In fact, the name of the novel Ivory and Bone refers to Mya and Lo's story (Lo is another female character in the book). So the romance is a prominent, but not the main point of the book.
I did love the prehistoric setting. Eshbaugh did a great job describing the everyday life of hunters/gatherers, their culture, traditions, beliefs and views on life. It is certainly not a sophisticated historical fiction, but I was impressed with the level of detail that the author was able to weave into the story. 4 out of 5 stars - an excellent read.