Lydia Ward now has magical powers. She has captured arch-villain Alorea Rakissen and made friends and enemies in the magical world. Now, she is going to Hogwarts to learn how to control her magic. Her life is about to become more interesting, exciting, confusing and dangerous

Ten year after the Battle of Hogwarts two Muggles discover and odd diary under unusual circumstances. Its entries lead them to meet Head Auror Harry Potter and to discover his magical world. Decoding the diary uncovers a plot to overthrow both the Muggle and the Wizarding worlds. The team of friends, old and new, must pool their resources and skills and try to foil this plan