Depth

I really enjoyed this book. It's a detective / mystery story set a couple hundred years in the future, when the polar caps have melted and much of the world's landmass is under water. It's set in a New York-morphed-into-Venice-at the 21st floor. There are some interesting worldbuilding details -- but the focus of the story is definitely on the mystery, not on the science fiction.

The main character and supporting character are both women, but they're very much not stereotypical women; I am sure that this enhanced my enjoyment of the book. I found the reading and the resolution of the mystery very satisfying. If I didn't already have several "wow" books on my Hugo nomination longlist, this would probably be a contender.