Henry was concerned about how the note got in his bag but decided to just let it go.
If the note was speaking of the magic shop he thought it was, then it was very close to the school so at the end of the school day, Henry said bye to his friends and headed towards the magic shop.
When he got there, he opened and he saw a young woman, probably in her mid to late twentys, standing at the resister. He wasn't going to get any closer until she called him over.
Once Henry was standing infront of the woman she said "I guess you got my letter then". Henry just nodded, trying not to make too much eye contact. "You'll need this to get your wish" the woman said as she handed Henry a plain silver ring. The woman went on to explain that the ring could swap the bodies of two people. All Henry had to do was imagine the person he wanted to be in his head and say "change". He could choose if he wanted to change to happen fast, slowly or even instantly by thinking of it at the same time.
Henry thanked the woman at the counter and asked how much. She said that it was on the house but not to waste the ring because it only works once on a person. In return she wanted to see him after the change. Henry took the deal but before he left he asked the woman what her name was. She said "Quin". Henry just smiled at her as he said "great, well I hope to see you soon Quin". Quin gave Henry a comforting smile as she watched him leave the shop.