While reading through the adventure one thing seemed odd.
WARNING! Spoiler!
At the graveyard it is mentioned that performing rites of Morr over fallen PCs will prevent them from rising as Zombies. What immediately came to mind was why there were rising Zombies from their graves in the first place?
After all there IS/was a priest of Morr delivering the last rites to the dead of Stromdorf to prevent such vile things to happen.
Do you have some plausible explanation I can give my players when this comes up during play?