Beartooth. By Callan Wink. Spiegel & Grau; 256 pages; $27. Granta; £14.99 This taut, compelling novel explores the great outdoors—and a realm of moral uncertainty. Thad and Hazen, two brothers ...

Matthew Bishop and Michael Green are co-authors of Philanthrocapitalism: How Giving Can Save the World, which is out in paperback next month. Bishop is NewYork bureau chief of The Economist and on ...