As the title says, this book is structured as a vortex, the absence of defined chapters bring you deeper and deeper in the madness of the journey and the jungle. It is in first person and the protagonist is not lovable in the least, but he does a good job in collecting stories from all these people he meets, reporting the conditions of Llaneros, Amazonian Natives and rubber tappers. While the characters are mostly fictional, the events are not, making it even more dramatic and impactful.
Overall was an informative and interesting read, if heavy, but the protagonist is loathsome, and I couldn't wait to finish hearing is whining and contempt.