"In a book that reads as an ethnographic whodunit mystery, Osseo-Asare masterfully threads five stories that describe the complexities of determining ownership of medicinal plant knowledge when this knowledge spans over time, communities, and countries. A product of years of field research in Africa interviewing healers, scientists, and community members as well as reviewing archived material, the author, a remarkable academic historian, in the end makes it clear that the overwhelming amount of twists and turns in the historical path that a medicinal plant can take on its way to becoming a drug makes it impossible to assign rights of intellectual property. . . . A must read for scholars as well as the general public interested in herbal medicine, from academics who specialize in African studies or medical history to researchers in the area of pharmaceuticals as well as policymakers who deal with ownership rights and patents."