Twisted: A Vampire Werewolf Freaky Friday by RA Winter

A curse has plagued the land of the witch and the only clue to save the world is in the form of a riddle. For centuries Tabitha has failed to release the death that has overtaken her world. Now, the vamps are mostly female, the werewolves are male. The witch must erase the curse before the land dies, but how can she convince these two warring species to work together before all is lost?