Richard Hannay, now fighting in the war, makes a second appearance, threading some hazy clues together and chasing across Europe to Constantinople, to defeat a German plot for a Muslim uprising in the Middle East. Femme fatale Hilda von Einem is the criminal mastermind; master of disguise Sandy Arbuthnot plays a key role, and John Blenkiron and Peter Pienaar make key appearances. The wild adventures include battles and a memorable  ride with the Cossacks.

Audio version, Librivox:

Available to read at

BBC radio adaptation by Patricia Hannah from 2005,