A stray unforgiveable gives Draco a gift he can’t give back and it helps him uncover a family secret linked to a series of murders five years later. With the help of Harry Potter they work together to solve the mystery of a familiar constellation.
War makes for strange bedfellows. However that doesn’t fully explain how Harry ended up sharing his bath with Draco Malfoy… nor why Malfoy was a rubber pato at the time.