"After the death of her adoptive parents, Brenna Anderson finds a mysterious necklace, the piedra de toque, or touchstone, which sparks curiosity about her past. Suspecting that she has an Indian heritage, Brenna goes west with a double purpose: to learn more of her parentage and to finish her father's book on the Sioux. Brenna and her maid, Mendy, visit the sprawling ranch of Kirby Chapman, a man she had fallen for three years earlier. While her love for Kirby still lingers, Brenna realizes that his Sioux step-brother, Brown Bear, stirs up desires that she never knew before. While Brenna unravels the mystery of her past, she faces some heartrending decisions. Kirby offers her love and a home of her own. Brown believes that together he and Brenna can rescue his beloved people. If Brenna follows her heart, can the legendary touchstone safeguard her from the danger that lies ahead?