Grim Reaper's Waltz.

When Isabella sees a middle aged woman dancing alone in the streets, she thinks it is a joke. But as more and more people join this woman in the strange flailing waltz that continues for days in
the mid Summer heat, she begins to see something oddly supernatural and possibly even worrying about this dance fever. The dance fever soon begins to trouble not only her, but the government of
Strasbourg itself. What is this dance fever, and how can it be controled.