This is Book 5 of the Heart of Texas Series by Debbie Macomber
Book 1: Lonesome Cowboy
Book 2: Texas Two-Step
Book 3: Caroline's Child
Book 4: Dr. Texas
Book 6: Lone Star Baby
Nell Bishop, widowed mother of two children, is turning Twin Canyons into a due ranch. One of her first guest is Travis Grant, a celebrity of sorts, a wannabe cowboy, an Easterner know for his books about the West. Nell's kids are crzy about him, and Nell she could fall for him herself. But its too soon to be thinking of love and marriage again. Too soon. Not only that Travis seems intent on stirring up the town by uncovering the mystery in its past.
The 5th story in the Sons of Texas series seems to be the pivotal book in the continuing Bitter End Saga. The mystery of Bitter End is finally solved.... if you've read the other four books, you definitely want to know this, but the story of Nell and Travis seems to be lost in the process.