seven
o'clock
What might lie in that ominous crimson patch , he could not even guess . However , he reflected , he was soon to find out , though he might never live to tell about it . Shrugging his shoulders , he turned into the fifty story building in which was his modest apartment . There he found , written by the automatic stylus on his radio pad , the message : `` Be with you at seven o'clock . Best regards , and I hope you strangle . Dex Harlow . '' * * * * * Dex Harlow was a six-foot Senior Lieutenant who had been on many an out-of-the-way exploratory trip .