The D.D.I. recognized him and smiled. "That was a great case you brought us. You'll be interested to hear that it is a case of mur-r-der "

For eight years Basil Thomson headed the famous C.I.D., New Scotland Yard. He knew the Yard inside out. Now in this tale of mystery and detection we are taken behind the scenes. We are shown the greatest detection machine in the world in motion, and see how the Yard tracked down its man.

Stand, then, with young P.C. Richardson on the misty corner of Baker Street, while the traffic of the city swings by, and fate lays at his feet...