The Reality Dysfunction - Staff Choice by Sophie The ultra-marathon of space operas. Everything about this book is gargantuan: size, setting, cast, plot, philosophy. It's steeped in physics, too. Oh, and part 1 of a trilogy. That said, I was glued to its pages, and experienced many a "NOOOOOooooo!..." moment as character after character found themselves in mortal peril (and often didn't survive :-( ). Not a book to be taken lightly, then, but if you're up for the challenge this might just blow your mind.