Arabella Figg watches as Harry receives his letter from Hogwarts. As she does so, hidden under James' invisibility cloak, she reflects on her and Harry's past. The cloak also has the ability to cause her to remember scenes from its past.

The wall between Harry's 2 worlds breaks down as secrets are revealed. We learn what motivates the Dursleys and why they are so set against magic. Eventually, they are drawn into Harry's fight against Voldemort. This story completes the Harry Potter saga.