If I give away anything here, please let me know, and I'll try to provide space to do so.
Anyway, first things first. One of the contracts is for dog tallow, I think, or it can be you talk to the grave digger for it. I don't remember, it's been a while since I did this particular mission. Anyway, the grave digger will clue you, somewhat, into the cemetery.Anyway, one of the people you are investigating may clue you into the cemetery as well. Clearing Thaler isn't super hard, but it is a tad harder than proving Vincent innocent.
The autopsy does have to be done in a particular way. This is the proper way to go with the conversation: (spoiler I believe, but if not, it's ok)
* “What do you think?”
* “His neck muscles and palms look tense.”
* “This is too easy...”
And this is the proper sequence to prepare for the autopsy:
Ask Raymond, Vincent and the Gravedigger about the autopsy. Also, read the books Forensic Medicine and Zerrikanian Insects and Other Vermin. You can buy both of them from the Antiquarian. The buy strong alcohol for the grave digger, and voila, the body will be ready at the time specified.