“Are you sure? They might come and investigate. Find us in here.”
“I doubt it,” said Finn. “Messages need to be repeated all the time. Especially trunk messages. It'll be safe enough.”
“But what are you going to send? A message to your parents?”
“No. Not directly anyway. I'm going to talk to Mrs. Megrim.”
“Surely someone could intercept the message and read it.”
“They can intercept it but they won't be able to read it. I remembered it, you see. The code she gave me.”
“What code?”
“The day I left the valley. You know I said she stopped the ironclads, stood in front of them and made them pull up. She gave me a piece of paper. I thought it was going to be a letter but it was just ten digits, nothing more.”
“An encryption key for the line-of-sight network.”
“Exactly. I lost the note p
