Brother & Sister. Modern fantasy (Werewolves, Vampires, Faeries).
╱╱ Background
From ancient times, werewolves and vampires have always been mortal enemies. Two particular groups in [town/city name] are particular tired of this war between each-other. The Unseelie Queen has seen the future, and leak information to both of the groups that the near future will give them a powerful alley. One that will tip the scale for their side. They are so excited about the news that each side goes in search of their future savior, but not everything the queen alluded to is true.
