Additional content from the point of view of other characters.
Once before is from Harry Potter's point of view. However, other character have thoughts and actions that impact the story, but it's awkward to try and explain those naturally in the main story. This does not need to be read to understand Once, but Once does need to be read to understand this. I will link chapters directly to their relevant chapters in once, so you don't need to try and keep track of where these scenes fall in terms of the main story line.
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