This is the third story in a trilogy that begins with the stories Resonance and Revolution, which I would strongly recommend reading before this. You can find them on this website by clicking on the author name somewhere on this page.
To quickly catch you up: Harry is nineteen in this story and an Auror Apprentice. He lives with his adoptive father, Severus Snape, in the mythical village of Shrewsthorpe. As the story opens, the characters are dealing with the aftermath of the most recent prophecy and the destruction that accompanied it