Sirius Black only thought of two things during his 12 years in Azkaban: his innocence, and his wife. Remus Lupin only had the company of one woman after the First Wizarding War, his best friend. The fifth marauder, the twin sister to their best friend, James Potter. But who is she? And why is she so important to Sirius and Remus? This is her story. The story of the fifth marauder and how she changed their lives.