Fairy tale AU.
Marinette and Bridgette are two beautiful sisters living in the forest. Marinette is as fair and pure as white roses while Bridgette is as bright and cheerful as red roses. As children they are very close and the best of friends, living a happy but sheltered life.
Adrien and Felix are the twin princes of the kingdom who unlike Marinette and Bridgette are very distant from each other. They have spent there all lives being controlled by their cold father and their vain stepmother never allowed to have any freedom. Adrien is carefree and rebellious wanting nothing more than to escape the castle walls but is Felix reserved and responsible and willing to accept his fate.
When Marinette and Bridgette grow into young women they suddenly find themselves on the run. Marinette is declared a traitor and a fugitive by the king and queen for reasons unknown to her so she must flee from the kingdom and fend for herself while Bridgette is hunted by a lord who wants to make her his twelfth wife so she has to masquerade as a boy to hide from him. Meanwhile Prince Adrien has suddenly disappeared so Felix must find him with the help of what appears to be a regular page boy.
It's a world that's a mix up of different fairy tales kind of like Once Upon a Time or Fables but it focuses mainly on the stories Snow White and Rose Red, Bluebeard, Snow White, and The Snow Queen.