It’s eight years after the Great War shattered Bennett Grey’s life, leaving him with an excruciating sensitivity to the potential of human violence, and making social contact all but impossible. Once studied by British intelligence for his unique abilities, Grey has withdrawn from a rapidly changing world—until an American Bureau of Investigation agent comes to investigate for himself Grey’s potential as a weapon in a vicious new kind of warfare. Agent Harris Stuyvesant desperately needs Grey’s help entering a world where the rich and the radical exist side by side—a heady mix of the powerful and the celebrated, among whom lurks an enemy ready to strike a deadly blow at democracy on both sides of the Atlantic.

Here, among a titled family whose servants dress in whimsical costumes and whose daughter conducts an open affair with a man who wants to bring down the government, Stuyvesant finds himself dangerously seduced by one woman and—even more dangerously—falling in love with another. And as he sifts through secrets divulged and kept, he uncovers the target of a horrifying conspiracy, and wonders if he can trust his touchstone, Grey, to reveal the most dangerous player of all ….