When Trace Malloy and Blaine Witherspoon collide on a desolate West Texas highway, their fender bender sets the tone for escalating clashes that will determine the future of the town of Conquistador.

Malloy, a ranch manager and lifelong cowboy, knows that his occupation—and his community—are dying. He wants new-millennium opportunities for his son, even though he himself failed to summon the courage to leave familiar touchstones behind.

Witherspoon, an ambitious, Lexus-driving techie, offers a solution. He moves to Conquistador to build and run a state-of-the-art...