Dune, by Frank Herbert
When I think through my favorite science fiction, I always come back to Dune. It’s a sweeping and powerful mix of intrigue with ecology. Herbert creates a unique but plausible world, and explores the forces that move through it. This book is the starting point of a series, but can be read on its own. If you haven’t read Dune, you’re in for a great read; if you have, maybe it’s time for another go.