A professor is abducted while hunting butterflies on the Afghan border.
Doublett and Mrs Cortez impersonate the Duke and Dutchess of Albany when Entente Cordiale is threatened by von Brauner's attempts to have the Duke killed and throw suspicion on the French.
Virgin is tasked with escorting a princess back to Akba. But, von Brauner plans to capture the princess and deliver her to Akba's murderous new ruler.
A Russian masterplan to bring down the British Empire is hidden in the St Petersburg palace of Prince Rouvaloff.
Virgin and Doublett have a desperate mission to Brazil thrust upon them when Colonel Shaw-Camberley learns that a vital rubber plantation is not being worked, and that the company manager's daughters are in dire danger.
Virgin and Doublett uncover a plot to stir the Indian princes against the British Raj, masterminded by von Brauner.
A Swiss professor develops a paralysing gas, and von Brauner is quick to see the possibilities if he can obtain the secret for himself and his ally Generalissimo Chu Chen Yu.
Von Brauner has been ordered to arrange the assassination of the King of Croatia.
An ancient prophesy tells of a white warrior who will cross the Silver Pass and claim the immortal Shang Li as his bride. Von Brauner plans to make himself the warrior, thus wrecking a proposed trade treaty; but Virgin has a trump card.
As the Colonel arrives in Egypt to investigate the disappearance of no fewer than seven British officers, he narrowly escapes becoming the eighth. Can Virgin's timely arrival help save the Colonel's life as well as thwarting a plot to seize the Suez Canal?
When Virgin is faced with a plot to assassinate the King and seize the Crown Jewels, he finds that he will have to work with von Brauner during the occasion of the state visit of the Kaiser.
When an Englishman in America invents a magnometer - a device that locates oil - he is kidnapped by von Brauner and would-be oil tycoon Big Jack.
At a time when the world is waiting for man to be airborne, it is rumoured that the Laird of Glencraig has invented a flying machine. Men of all nations want the secret - among them the wily von Brauner...