Determined to find the men responsible for her disgraced father's murder, Lady Arianna Hadley disguises herself as a man and contrives to be hired as a chef in one of London's aristocratic households. But when the prince regent is poisoned by Arianna's special chocolate dessert, she finds her own quest has become intertwined with a far more deadly intrigue. The earl of Saybrook is asked by the government to investigate. When someone tries to kill them both, they become reluctant allies in the hunt to discover what evil is afoot.   

Lady Arianna, now the Countess of Saybrook, is settling into married life with her new husband. To celebrate his birthday, she finds the perfect gift: a rare volume of botanical engravings on Theobroma cacao - or chocolate - in an exclusive bookshop. But she is forced to fight off a stranger who tries to steal it way from her. Arianna forgets about the strange incident - until she and her husband attend an important government party on a country estate, where her assailant reappears and turns out to be a Russian diplomat.

Lady Arianna Hadley and her husband, the Earl of Saybrook, want nothing more than to savor a quiet life embellished by the occasional cup of the finest chocolate. However, when they receive orders to travel to Scotland and capture an elusive traitor, they feel their duty to the Crown must come first. In a laboratory in Scotland, they discover the corpse of a chemistry professor - and cryptic papers hinting at a dangerous new discovery now in enemy hands. Racing against time, Arianna and Saybrook pursue their most cunning and dangerous adversary

With the hunt for a diabolical traitor finally over, Lady Arianna is looking for some peace and quiet in which to resolve lingering tensions with her husband over her daredevil exploits during the final chase. But an unexpected late night visit from The Dragon - Saybrook's feisty and independent great aunt - puts her in the middle of a very difficult dilemma....Constantina confesses that some very private personal letters, along with some sensitive diplomatic documents, have been stolen from her French paramour. 

With the threat of war looming over the Continent now that Napoleon has reseized the throne of France, London is abuzz with intrigue as diplomats from the European powers gather to negotiate a military alliance against him. But Lady Arianna and her husband, the Earl of Saybrook, are intent on staying clear of the conflict, deciding it's a battle for nations and armies to fight. Until things turn very personal. When a Prussian diplomat is murdered, two items found in his pocket force Arianna and Saybrook to once again become reluctant allies with the shadowy head of British security.

With the epic victory at Waterloo behind them, Arianna and Saybrook are looking forward to a quiet summer of scholarship, far from the turmoil of war and politics. But little do they know that an even more dangerous battle is about to test their mettle. The shocking news that Lord Grentham, the steely minister of state security, has been accused of treason and is on the run from arrest takes them and their close circle of friends by surprise. Arianna and Saybrook don't want to believe it. Despite their fraught past with the minister, they've developed a grudging friendship.

A traumatic personal crisis has left Lady Arianna bedeviled by guilt and questioning whether she has lost her nerve. Her circle of friends can't seem to help rekindle her fire. Even a challenge from Lord Grentham, Britain's shadowy head spymaster, to undertake a vital mission to Russia in aid of her old friend, Tsar Alexander, fails to spark any interest . . . Until Grentham mentions that Arianna's half-brother has gone in her place and may be in mortal danger. Resentful of the minister's attempt to manipulate her emotions, she still refuses to be drawn back into the fray.

The winds of change have brought great joy to Lady Arianna and Saybrook, who have recently welcomed an infant son to their family. They are still adjusting to their new life when a letter arrives from Arianna's dearest friend and former comrade-in-chicanery inviting them to a gala fiftieth birthday celebration in Switzerland. With the blessing of their surgeon friend, they decide to make the trip, only to find themselves once again drawn into a dangerous web of political intrigue that may ignite war throughout Europe.

A gripping Regency tale of greed, temptation, and the deadly dance between truth and lies. London, 1817: For Arianna and Saybrook, a rare interlude of peace at their country estate with their young son has been a much-needed respite from their undercover missions for the British government. But...