I finished The Invincible by Stanislaw Lem! I finally just sat down last night and spent an hour or so getting through the last 20%, and now I wish I'd done that sooner. It's a neat little story about an unknowable threat on an alien planet; a lot of time is spent with crew scientists conjecturing why things are the way they are, but neither the characters nor the reader ever find out for sure. I found this both refreshing (not having the answers keeps things interesting) and frustrating (lots of dialogue and musing bog down the pacing). The last chapter finally dispenses with so much talking, but then ends somewhat abruptly. I liked it, but more in a "the storytelling was interesting" kind of way.

Still picking out a new book.