The words "Dear Hargreave" were all that remained of the message. With a snarl of rage Braine whipped out his revolver.
"I will give you one minute to tell me what that paper contained."
"And after that minute is up?"
"A bullet in your stomach."
Quick as a flash Jim's hand shot out, caught the loosely held revolver, gave it a wrench, and brought it down savagely upon Braine's head. Then he reversed it and backed toward the front entrance.
"Au revoir, till we meet again, gentlemen!"
CHAPTER XXI
Jim said nothing at first about his adventure to Jones, whom he met half an hour later.
"Was it necessary to keep that invisible letter?" he asked.