With My Last Scream

From publisher blurb:

Warning: This adventure depicts domestic violence and physical/verbal abuse

An adventure for master characters

With My Last Scream takes master characters to another location near where they are adventuring, and you can introduce it at any point in the game thanks to the main character: the ghost of Perdita. Turn down the lights, add in some ambient sounds, and see what the adventurers make of this haunted house trap and its sole, lost inhabitant. You might consider preparing some visual aids ahead of time, too.

Perhaps, during this scenario, the characters will discover—or have underlined for them—that the worst monsters can be human.