I think the plot is basic enough that it could come from a hundred places - its nice and simple. Wrongful death. Curse. Lift Curse.
Now, wrongful death is so common that the story needs to turn on why the beggar woman had such power? Favorite of some god? Was she once a powerful witch fallen on hard times? Evil is rarely punished, so why now?
I am a bit curious as to why she cursed the entire city. Is this a large city? Is there a disproportionate number of poorly treated beggars?
What don't you ever get hungry and binge and walk away in disgust. Could be cannibals on a diet that had a cheat day and then realized what they were doing and quit...you never know. :)
Plots (Discovery) (Campaign)