Greenmantle continues the thrilling adventures of Richard Hanny. The story takes Hannay from convalscence following the Battle of Loss, back to London for a vital meeting at the Foreign Office and thence on a top-secret mission across wartorn German-occupied Europe. His mission; to0 neutralise and destroy a cunning and potentially devastating German plot to foment Holy War in the Islamic Near East, which could ignite a powder-keg and shake the balance of world power and the course of the war.