After being attacked by a strange being in the dead of night, a young unicorn mare named Page-Turner finds herself transformed into a loathsome, terrifying creature with an uncontrollable need to drink the blood of others through horrific means. Frightened by her sudden change in both body and nature, she flees from pony society but tries her hardest to remain a part of it in the process.

As her attempts to cope and adapt to her new lifestyle sour and wither with every passing day, she finds herself being hunted by those that wish to see her destroyed. With little choice to begin with, the only goal to dominate her mind soon becomes survival.