Planetfall

Planetfall was on my Hugo Best Novel ballot in 2016, and the series was on my Best Series ballot in 2020. It's a mystery which gradually evolves into an understanding of what's really going on. I especially thought the description from the main character's point-of-view did a fantastic job of showing how mental illness and/or PTSD can look from the inside, and how it distorts the perceptions of the person suffering from it. The ending seems a bit abrupt and rushed, but I really enjoyed this novel and the way it explored the evolution of a colony and of the main character.