Lovely, low-key, and a little sad. Although Harry’s “deductive reasoning” made sense, I can’t help thinking he was writing to himself. Whatever the truth, I enjoyed reading the letters and all the descriptions of the writing process. This was very touching:
Harry closed his eyes, seeing a young Snape in the Slytherin dormitory, knees drawn up to his chest and elbows sticking out at odd angles as he borrowed ink from a classmate. Pretending that he'd only forgotten his inkwell, pretending that he was too busy to go into Hogsmeade and buy more, pretending that he had enough – Harry had made up the same excuses when Dudley stole his lunch or snapped his pencils. He'd swallowed hard and pretended, as if it made a difference when everybody knew.
Everybody knew that Snape was a hero now, but nobody had known when it would have made a difference to him.