The Girl In The Cage

This is a Beauty and the Beast retelling, but with a twist!

For years Salvatore has been terrorized by a fearsome monster, animals had been found slaughtered all around the kingdom, and even children had been seen following an unseen voice.
The prince is nowhere to be seen and a curse stalks the castle, changing the servants each and every night.
The people of Salvatore believe that if they sacrifice a human to the monster, their town will be free from the monster at last.

But the thing is, their sacrifice isn't exactly human.....