The writing wasn't bad, but there were a few things that bothered me some. The entire first chapter, as well as other parts, felt disjointed, as things were either told out of a cohesive order or sometimes you couldn't tell who was being referred to; "he" doesn't help when you have multiple males in the story. At times words were used that didn't make sense because they were being used incorrectly ("ichor" doesn't actually mean blood so I didn't feel it should've been used as such) or paragraphs would become flowery and overly-descriptive. Then there were things like Rook following the sound of groaning before he found the first body, but with the condition the body was in, there's no way that person would've still been groaning (think Jack the Ripper-level damage); shooters being able to take aim and shoot at only Rook (from outside) while he was in a room where the windows were boarded up; saying that Rook was in a certain place when O'Rourke called time of death on Dani, but O'Rourke had said she didn't have that body; and Rook's grandfather's speech pattern constantly switching from old money to backwoods. And constant references to a movie without naming the movie, if a reader has never seen that movie then Rook's references won't come off as funny at all, which was the case for me. Also, what really happened to Vince after he was fired? What happened to Madge?
As for the cast of characters, I liked Manny and Dante. Dante's partner I really couldn't feel anything for. For someone who'd been on their own for as long as he'd been, Rook seemed quite immature and made a lot of dumb decisions. The bad guy wasn't hard to figure out, but fortunately the motive wasn't as obvious so at least that was something to stick around for. The sex scenes were just okay.