A staggeringly well researched, magisterially comprehensive, and surprisingly entertaining resource on nearly every aspect of Upper Amazonian shamanism – not just the use of psychedelic plant medicine, but shamanic extraction, spiritual warfare, herbal remedies, and more. I especially appreciated its willingness to engage in real theoretical reflection on the anthropological questions involved: what it means for shamanic ceremony to rely so heavily on performance, for instance, or how the phenomenology of “hallucinations” is culturally constructed. There are also important, detailed, and quite readable scientific excurses, such as on the chemical mechanisms of DMT and the role of B-carbolines in the ayahuasca brew. While the book often repeats itself and could have used some more judicious editing (you will hear three times, I think, about the sounds that aliens make according to two different shamans, and I thought that if he introduced the frequently cited Cesar Calvo as “the poet Cesar Calvo” just one more time, I’d go mad), it’s a small price to pay for a truly indispensable resource for anyone interested in Upper Amazonian shamanism and/or plant medicine in general.