The year is 1757. On a bright June day, Lord John Grey emerges from his club, his mind in turmoil. A nobleman and a high-ranking officer in His Majesty's Army, Grey has just witnessed something shocking. But his efforts to avoid a scandal that might destroy his family are interrupted by something still more urgent: the Crown appoints him to investigate the brutal murder of a comrade-in-arms, who might well have been a traitor.

Obliged to pursue two inquiries at once, Major Grey finds himself ensnared in a web of treachery and betrayal that touches every level of society - and threatens all he holds dear. From the bawdy-houses of London's night world to the drawing rooms of the nobility, from the blood of a murdered corpse to the thundering seas of the East India Company, Lord John follows the elusive trail of the woman in green who may hold the key to everything - or to nothing at all.

The early days of the Seven Years War come brilliantly to life in this historical adventure mystery by the acclaimed author whose unique and compelling storytelling has engrossed millions of readers worldwide.