The best sci-fi novels overflowing with intrigue and mystery

A galactic empire. A space station on the outer fringes. Mysterious aliens coming from the darkness. I love how Arkady Martine’s twisty space opera is just teeming with life; she creates a world that seems so different from ours, but is instantly relatable. This story, of an ambassador dispatched from that remote station to the Empire she’s always admired, only to discover that her predecessor was murdered and the chip containing his memory sabotaged, kept me guessing throughout. Plus, you don’t want to miss the scene with some extemporaneous brain surgery.

I love a good space opera, and John Scalzi’s second to none in that department. In some ways, this book (and the two that follow it in The Interdependency series) remind me of the original Foundation, as an immense space empire under a new and untried leader struggles to come to terms with an imminent catastrophe that could bring it to its knees. I personally found the foul-mouthed and irreverent Lady Kiva Lagos a particular delight, as a force of nature that bulls her way through any obstacle. 

Okay, it’s the second book in the tremendously popular series The Expanse (perhaps you’ve heard of this little series turned TV show), but it’s also my favorite. That’s because Corey ramps up the intrigue as Mars, Earth, and the Belt find themselves enmeshed in an open war that has some decidedly murky underpinnings. This volume also introduces two of the series' best and most memorable characters: Martian marine Bobbie Draper and savvy Earth politician Chrisjen Avasarala. The book kicks off with a bang, and doesn’t let up, concluding with perhaps one of the most page-turning action sequences I’ve ever read.

This is probably my favorite book of all time, from my favorite series of all time, The Vorkosigan Saga. Miles Vorkosigan, spy and accidental leader of a mercenary fleet, comes face to face with his mortality when he’s injured during a mission. As he recovers, he has to rebuild his life and his identity and find a new purpose in an empire that prizes warriors—a long-running challenge for this diminutive disabled hero. Meanwhile, one of his mentors, spymaster Simon Illyan, is dealing with a threat that could not only unravel his own life but decades’ worth of the Empire’s secrets. It’s funny, tense, and touching all at turns; I can’t think of that many sci-fi adventures that will have you laughing and crying. 

Combining a murder mystery with a colorful sci-fi universe that’s full of magic? Yes, please. Odd couple Lieutenant Iari and Ambassador Gaer (who, don’t let the title fool you, is actually an alien spy) have to team up to discover why a retired battle-mecha killed someone—an occurrence that should be impossible. The rapport between Iari and Gaer is a delight, and the plot quickly unfolds from a mere murder to something far more sinister. I absolutely love the world that Eason creates—it has the scale of a video game-like Mass Effect while simultaneously creating compelling characters.