A retired detective is drawn back into service to solve the murder of a British diplomat in pre-revolutionary St. Petersburg. Powerscourt, a man who prefers the quiet of retirement, finds himself entangled in a dangerous investigation when a diplomat is found dead on a bridge over the Nevskii Prospekt. The victim's knowledge of a dangerous secret led to his demise, and Powerscourt must navigate the treacherous political landscape, including the watchful eyes of the Okhrana, the Russian secret police. With revolution brewing and time running out, Powerscourt must uncover the truth and escape Russia before he becomes the next victim.

The book is praised for its rich historical detail, drawing comparisons to the textured canvases of artists like Turner. Reviewers highlight its appeal to fans of British historical mysteries, noting the engaging adventures of the protagonist, Powerscourt. The narrative is described as splendid entertainment, offering a compelling blend of crime-solving and historical atmosphere. The plot is set to deliver a suspenseful experience as the protagonist races against time in a politically volatile setting.