Political forces are pressing British National Fisheries scientist Alfred Jones into helping a wealthy Yemeni sheikh introduce salmon fishing to his home wadi. Jones is a man of reason and logic, yet he is emotionally stunted and unsure of himself. In the evenings he gives lectures on “Why God Cannot Exist.” He is in a cold marriage to a calculating financial analyst who is deeply invested in the success of both of their careers. The Yemeni fishing project eventually sinks both Jones’s marriage and his career, but Jones himself is gradually transformed. By the end of the book, he believes that he understands something about the nature of faith—both its risks and its rewards.