"What message?" the young man demanded.
"You will send out a general call, as before, repeating the latitude and longitude with a difference of exactly three points, and you will repeat the altered course, only you will substitute the word 'south' for the word 'north.'"
The young man's eyes suddenly gleamed as he turned towards the instrument, but Crawshay smiled with grim understanding.
"Let me tell you that I understand the wireless," he said impressively. "You will give the message exactly as I have told you or we finish things up on the spot. I think you had better. It's a matter of compulsion, you know—in fact I'll explain matters to Mr. Jocelyn Thew, if you like."
The young man's eyes were round with amazement.
"Jocelyn Thew!" he repeated.
"Precisely. You needn't look so terrified. It isn't you who have given away. Now what are you going to do?"
The young man swung round to his instrument. Crawshay released his hand, stepping a little back.
"You are going to send the message, then?"
"Yes!" was the sullen reply.