Hi! Please, write a detailed plot for a short story with these elements:
- The setting is the contemporary world and time.
- The Balrogs from the Tolkien Legendarium are real, but they were hidden for thousands of years and now awake.
- The elves from the Tolkien legendarium that had gone to the Land of the Valar come back to fight the Balrogs.
- The world population is not aware of any of this, because the war is kept hidden from them.