Book excerpt: After living in El Salvador and witnessing the cost of the political violence and economic hardship there, Mark and Louise Zwick founded Casa Juan Diego. Mercy Without Borders tells the story of the beginnings of the Catholic Worker in Houston, a city that has become a destination for waves of refugees from Mexico and Central America. Over the years, they have received the poor, the weary, and the destitute, seeing only the face of Christ regardless of immigration status. In addition to sharing their stories of Casa Juan Diego and many of its guests, the Zwicks analyze some of the causes of the economic imbalances that result in destitution south of the U.S. border, in countries where people toil in factories for little or nothing, only to see the fruits of their labor shipped to the affluent north. Why would these victims of injustice not seek a better life for themselves and their children? Book jacket.