The Outlaw's Twin Sister by Stephen Bly

Julianna Oritz, the aunt of Paco, runs the Lordsburg jewelry store. Her twin brother, Guillermo, is in a Mexican jail due to be executed in three days. Refusing his appeals to help him escape, Julianna returns to Lordsburg encountering DelNorte, mysterious and charming. Bandit Ramona Hawk has yet again escaped from prison and is terrorizing the countryside, determined to even the score with Guillermo, DelNorte and Julianna. The sometimes humorous dialogue captivates the reader, entertaining to the end. A good read. Sandy Penton