It's The Maurders fifth year, they mastered the ability to transform into their animal forms. Remus' little sister, Kris, wants to join their little group, but Remus wont hear of it. James knows that the real reason is so she can get closer to Sirius. Greyback is after Remus but has been eyeing Kris, he is planning on changing her and taking her with him if he doesn't get Remus.