Texas! Sage (#3) by Sandra Brown

In the dramatic finale of #1 New York Times bestselling author Sandra Brown’s popular Texas! trilogy, the headstrong youngest daughter of the Tyler family finally steps out of the shadows cast by her two older brothers. But forging her own path will take every ounce of savvy in Sage Tyler’s possession.
 
The youngest heir to her family’s oil fortune, Sage has always been the unbridled spitfire in the Tyler clan. Now, fresh out of college, she’s looking to settle down at last with her safe, upper-crust fiancé. Then into her life saunters Harlan Boyd, a rootless drifter recently hired for a Tyler Drilling Company project. Harlan’s just the sort of man Sage should avoid, but there’s something irresistible about the laconic cowboy that intrigues her.

When a financial crisis threatens to wreck Tyler Drilling for good, Sage and Harlan must channel their simmering chemistry into the task of saving the family business. But can she trust a man who shares her maverick spirit—and harbors long-held secrets of his own?