[Doc Faustus]

I know you do not write frequently, so pardon me if this seems really gauche of me to say: that is a horrendous first sentence. Don't do anything like that again. Never tell people point blank that there is incomprehensible horror. It guarantees a response ranging from an eyeroll at best to no longer reading the story. It looks like a very cheap trick. Also, do not have your detective confess his phobia two paragraphs in and expound on it, particularly if he doesn't know exactly why he has this phobia.
Good:
"Blood. Why don't I ever get used to it?"
Bad:
"I'm afraid of blood even though Iwork around blood all the time. It's a contradiction and to be honest I don't know why they hired me to do this job and how nobody notices and keeps on sending me to crime scenes. Guess I'm just lucky or that chief of police is some kinda big silly. All in all, this is a character trait that you'll remember me for, that's for sure."
Don't be too talky and don't tell people what conclusions to make with superlatives about the awesomeness of the murder.