Blackout (Pete Fernandez) by Alex Segura

Now sober, Pete Fernandez the reporter-turned-private eye is back to investigate a cold case from his own past. A girl he had a crush on in college was murdered before it could go anywhere. When new evidence in that case turns up Pete is compelled to investigate of course. He travels from NYC back to Miami where he meets his old partner and former lover Kathryn as well as his FBI agent friend.
The investigation leads him to a dangerous cult and what seems to be a political assassination.
The stakes are higher than ever and the last few chapters are very, very cinematic and exciting. But that last chapter... That last chapter will have you leaving full of surprise for sure...
With every novel Alex seems to become more ambitious and the story more multi-layered, luckily without losing some of the good more pulpy elements of the genre like a wisecrack or two and some good fight scenes. I love how the relationship between Pete and Kathryn evolves, as always reminding me of McKenzie / Gennaro from the Dennis Lehane books. I was sad to see that series end. If you were too, this will be the series for you.