“Me for Whittington!” said Julius darkly. The train was just starting as he swung himself aboard. “So long, Tommy.” The train slid out of the station.

Tommy drew a deep breath. The man Boris was coming along the platform towards him. Tommy allowed him to pass and then took up the chase once more.

From Waterloo Boris took the tube as far as Piccadilly Circus. Then he walked up Shaftesbury Avenue, finally turning off into the maze of mean streets round Soho. Tommy followed him at a judicious distance.