The Quantum Thief

Charming, witty, intersting characters but a bit much deus ex machina towards the end.

I also don't think “hard sci-fi” fits the bill. The story tilts far more towards the whodunit than the hard sci-fi part and what sci-fi is there is not explained plausibly enough to be hard sci-fi.

Still, I'll definitely give the sequels a chance as it was entertaining just for some of the ideas alone.