"Here Colonel Grant, virile hero of 'The W Plan" emerges from obscurity at the hour of his country's peril. In this story one enjoys a tale of espionage, diplomatic intrigue and high adventure ... for here we observe the Intelligence Bureau of the War Office at work; we enter the labyrinth of the mysterious political underworld of Central Europe; we penetrate the fastnesses of the African desert in an enthralling quest for the secret of the scar which forms the theme of this book."