Why was McDonald astonished to see the message written on the notebook?

Chapter please?

That sounds like a fascinating plot twist in a story because it is always intriguing when a character finds a hidden message they never expected. I think those moments of shock really add a lot of depth to a mystery and make you wonder about the motivation of whoever wrote it. It reminds me of those mornings when you are in a hurry and just looking for something simple and familiar like a bk breakfast menu to start the day. Sometimes life is just easier when things are straightforward rather than full of surprising secrets in notebooks. I would love to hear more about what the actual message said and how it changed the rest of the story for him..