Desperate Measures (1974) By Dennis Wheatley
 
1814. The Irish Witch is dead, and Europe at peace. Roger Brook, now Lord Kildonan, is content to divide his time between his young wife, Mary, and his life-long mistress and spirit-companion, Georgina.

But as the fashionable world glitters at the Congress of Vienna, the power-hungry Napoleon is about to plunge the continent into war once more. And Mary, possessed by demonic jealousy, is hatching a plot which threatens Roger's fortune – and Georgina's life.

Reluctantly, Roger Brook must assume his old identity – as Europe's most daring secret agent.
 
Hard Cover with Dust Jacket
415 pages
In Fair to Good Condition