A Gravedigger’s Gratitude
Outside the cemetery’s main gates (#1) you’ll come across the Gravedigger working on some new coffins. If you talk to him he’ll agree to let you into the cemetery if you can either get a pass from Vincent or pay off his debts to Thaler.
In order to do either of those you’ll need to clear both of those men as suspects. This mean completing the Suspect: Vincent Meis for Vincent or the Suspect: Thaler quest for Thaler. Once you have cleared either of them of the crime then go back and visit the Gravedigger. He will give you the Cemetery Key along with the formula for Petri’s Philter.
Once you have access to the cemetery you’ll be able to enter the crypt (#2) and find Raymond’s body, indicating that someone killed Raymond and is pretending to be him.