Just finished Ben H. Winters' apocalyptic police procedural "The Last Policeman" and highly recommend it. If you like crime fiction but refuse to read Sci Fi it might be time to reconsider. Anyway, it's probably more alternative history than Sci Fi but the approaching lethal asteroid determines the mindset and nature of what is essentially a whodunit. I recently read Kingsley Amis's famous survey of Sci Fi, "New Maps of Hell", from the 60s where, amongst other things, he urged Sci Fi writers to lift their literary game and explore the possibilities of a union with crime. Winters has done both. The sort of book the enthusiasts swallow whole which is a shame because his writing and characterisation is regularly nuanced and sophisticated. But he also understands the structure of a thriller and the need to maintain tension and pace. Unfortunately it's part of a trilogy, although it can be read as a stand alone, and generally I resent having to wait for "the ■■■■ to crow three times". I'll give the next one, "Countdown City", a run but only because this one was so good but I'm not sure I want to read the finale with its inevitable "impact" finale.
I don’t think I agree about uniting sci-fi and crime. The science fiction I have got most out of is the type where some supervening event or discovery places the human race under pressure, and the author uses that setup to explore aspects of human nature. John Wyndham was the best at this, and he also wrote very nicely, which is a big plus in a genre where barbarous writing is the general rule.
The problem with uniting sci-fi and crime is that the crime takes over, so that the story becomes CSI or Law and Order, but with wild cards consisting of more or less magical new techniques or substances. The Tom Cruise film Minority Report was an example of this.
At least that’s better than most current sci-fi, which is basically Cops and Robbers or Cowboys and Indians in Outer Space. With funny names and light sabres.