Joanna Greenfield dreamed of traveling to East Africa to study one of the last known populations of wild chimpanzees. When she was offered a once-in-a-lifetime chance, the young student set off from peaceful Kenya into politically hazardous Uganda. From there, a small team of guides led her into the mountains. In stunningly evocative language, Greenfield depicts the beauty of the rainforest and the determination required to wait for one transcendent...