The Brotherhood of the Screaming Abyss reveals the story of the McKenna brothers' eye-opening expedition to the Amazon in 1971 for psychedelic research. Once introduced by famed psychedelics advocate Timothy Leary as "one of the most important people on the planet," radical philosopher Terence McKenna was an iconic legend in the psychedelic community. He died in 2000, but his ideas live on in the writings of author Dennis McKenna. On their Amazonian journey together, the brothers explored the outer limits of psychedelic experience and were haunted ever since by the curious events that overtook them in that primeval rainforest.

(From Goodreads)