Worth a Fortune — Nancy Robards Thompson

Finally he'd stumbled upon good fortune…

But would the truth cast it away?

Camden Fortune's tantalizingly close to realizing his dream: opening an equestrian school for underprivileged children and finally claiming his rightful place in the Fortune family. So dogged reporter Haley Perry arriving in Chatelaine hot on a scoop, dredging up the disaster at the Fortune Silver Mine, is Camden's nightmare come true. But Haley's got a way of convincing Camden to join forces to discover the truth. And as she turns up the heat on her investigation, it's got nothing on the flames sizzling between them! 

From Harlequin Fortunes of Texas:

Book 1: Fortune's Baby Claim by Michelle Major
Book 2: Fortune in Name Only by Tara Taylor Quinn
Book 3: Expecting a Fortune by Nina Crespo
Book 4: Fortune's Lone Star Twins by Teri Wilson
Book 5: Worth a Fortune by Nancy Robards Thompson
Book 6: Fortune's Convenient Cinderella by Makenna Lee