"Detective-Inspector Chippenfield of Scotland Yard. Tell Inspector Seldon I want him, and be quick about it." "Yes, sir. Hang on, sir. I'll put you through to him at once." Detective-Inspector Chippenfield, of Scotland Yard, waited with the receiver held to his ear. While he waited he scrutinised keenly a sheet of paper which lay on the desk in front of him. It was a flimsy, faintly-ruled sheet from a cheap writing-pad, blotted and soiled, and covered with sprawling letters which had been roughly printed at irregular intervals as though to hide the identity of the writer.