The cemetery crypt is located inside Vizima's cemetery, in the north section. Spoiler warning: Significant plot details follow. In the crypt, you can find the corpse of the real Raymond (the detective). This proves that the "Raymond" who is currently passing as the detective is actually Azar Javed, and that the other suspects are innocent. There are also some ghouls, alghouls, fleders and cemetaurs to fight and there is some interesting loot. Cat potions and Necrophage Oil are useful.