This actually may be the shortest review I ever write. William S Burroughs did it better, but Ayahuasca is at least a linear narrative. If this makes no sense to you, go look up Burroughs and The Naked Lunch on Wikipedia. Do this before you buy the book, and consider that they share themes and actions.
I read Ayahuasca in one sitting, finding it rather horribly compelling. I didn’t like it (I didn’t like The Naked Lunch, either) but I can’t deny its fascination. Not for the easily disturbed….or maybe for the very disturbed. Four stars.