Gideon the Ninth (The Locked Tomb, #1)
by Tamsyn Muir
Usually I'm picky about SF&F that doesn't rethink cultures from the ground up, but this is the kind of book that will not just make "Mean Girls" references and "that's what she said" jokes in what's sometimes implied to be a far future version of our solar system, but make you laugh at them. It's all about the characters, and the characters are worth it. Five stars, all the way to the last chapter or so.
...And I was not into the ending, and I'm moderately pissed about it.
But also it filled me with unholy glee, and I want to talk about it with everyone! So, IDK, shit's very weird.