The man known as the Dorset Devil is the bravest and most cunning of the gentlemen who chose the Secret Service of the British Crown as their profession. He changes faces and names, remaining his own both in luxurious ballrooms and in dirty dark corners. But the main goal is a mysterious enemy who is not inferior to him in intelligence and still remains elusive... In the capital's world she is known as a lover of fun and entertainment, the frivolous Countess Francesca Cavendish. However, in reality, she is a fearless and ruthless avenger, acting incognito to find and destroy those who mercilessly dealt with her family and friends... Love is not included in the plans of these two, each of whom is literally obsessed with his mission. However, does the heart obey the voice of reason?