Brother's keeper

"There is no hope for escape [from Communist North Korea for Sora Pak and her family] . . . until war breaks out between North and South Korea. Suddenly there is chaos, and everyone is fleeing. The Paks' plan to get to freedom is simple: they will walk hundreds of miles from their tiny mountain village to the South Korean city of Busan. But when a bombing changes everything, Sora must get herself and her eight-year-old brother, Youngsoo, to South Korea alone-across rivers, over mountains, around enemy soldiers and border guards, and even through Pyongyang itself, all while staving off frostbite and starvation. Can two children survive three hundred miles of war zone in winter?" -- adapted from jacket.