In six essays, Müller and Gutiérrez detail the complex reality of multidimensional poverty and the gospel mandate for a preferential option for the poor, and they invite all the faithful into the fruits of their reflections. While the text may be challenging for non-theologians to read, those seeking to take up Pope Francis’ call to go to the margins and build a culture of solidarity will find On the Side of the Poor a satisfying and inspiring read.