The Swarm is a science-fiction book that focuses on biology and genetics. The main premise is that there are aliens living in the oceans, who have been there much longer than humans. The aliens are much smarter than we are, and have gotten really tired of our destructive ways.
Most of the characters in the book are scientists, from different countries and branches of science. They are trying to connect the dots between the many catastrophes and plagues that are happening around the world – in the hopes of discovering the source of it all.