The Green Brain initially published as Greenslaves, is a science fiction

Science fiction

Science fiction is a genre of fiction dealing with imaginary but more or less plausible content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities...

 novel by Frank Herbert

Frank Herbert

Franklin Patrick Herbert, Jr. was a critically acclaimed and commercially successful American science fiction author. Although a short story author, he is best known for his novels, most notably Dune and its five sequels...

.

Plot introduction

The book is set in the not-so-distant future, where humankind has all but succeeded in controlling all life on the planet and almost completely wiping out all insect life. The earth is divided into a "Green Zone" which humans totally dominate (or so they believe) and a diminishing "Red Zone" that is not yet conquered.

The "Green Brain" of the title is an intelligent organism that embodies and arises from nature's resistance to human domination. It is able to command social insects to form humanoid-shaped collective organisms which it uses to infiltrate the "Green Zone".

The book is about a small team sent in to the jungles of Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

to investigate the problem, who find out that some of their assumptions were wrong.