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I would recommend The Quantum Thief in the science fiction department. It has a bit of romance thrown into the a mystery of a famous thief trying to find something he hid from himself. This takes place on Mars in the far future, past the Singularity where AI has become self aware. It has a sequel, The Fractal Prince, with a final book in the series due to be published July 17.

A lot of my frieds recommend Jim Butcher's Dresden Files series and Terry Pratchett's Discworld series. I haven't read any of Butcher's work but I enjoyed the two Discworld books I read. The world building was excellent and both had a style of mystery to them but I wouldn't say romance was a significant factor in them.

If you are interested in standalone books, Neil Gaiman's and Terry Pratchett's Good Omens was a good read. It didn't have much in the way of romance, though.

If you are open to something non-scfi/fantasy, I recommend The Informationist. The story is an action/thriller/mystery. It's world, sub-Saharan Africa, is remote enough to be interesting and the lead character is developed exceptionally well. And it has romance. The romance between the lead and someone from her past plays a large role in the storyline.

And if you enjoy some magical realism, alternate history, and literary escapades, Jasper Fforde's Thursday Next series is a blast to read. The Eyre Affair kicks it off in style.