This comparative look at Roman Catholicism and Twelver Shi'i Islam focuses on the linkages between these two religions rather than on the seemingly intractable differences between them. The authors compare the histories of the two faiths, consider parallels between important figures in each, and highlight the doctrinal, structural, and sociopolitical similarities they share. Balanced in tone and carefully researched, the book helps explain the essence of both traditions while enriching our understanding of each.