Whispers had always followed them around. People said that they were put in their houses by mistake, that the Sorting Hat had messed up with them. A dyslexic Ravenclaw, a Hufflepuff who can't control her anger, a Gryffindor plagued with anxiety, and a kind but blind Slytherin are the known pariahs at Hogwarts School of Witchcraft and Wizardry.
The Sorting Hat placed Bella Letter, Scarlett Woods, Levi Johnson, and Evangeline Gray in their respective houses when they were each eleven years old. Now, four years later, they still haven't managed to discard that title.
The four outcasts find each other, and band together for two reasons: to help one another, and to return the hell they were given for four years.
Pariahs are only pariahs until they fight back.