We are not alone

the long version

"In this novel, American physician David Abravanel travels to the Peruvian Amazon to pursue research on rainforest plants. With his mentor, aging jungle botanist Bart Campbell, he embarks on an expedition to learn the plant medicine secrets of an Amazonian "lost tribe," the A'i'tian'tesi. The obstacles in their way, including an evangelical missionary who wants to westernize the tribe and a hostile, mysteriously powerful tribal shaman who holds his secret knowledge in a perilously tight grip, make their mission difficult and dangerous. What they learn in the rainforest changes David forever."--BOOK JACKET.