To all appearances Jack Swann is a typical gentleman of the Regency period; educated, cultured and affluent. In his early thirties, he is an attractive and eligible bachelor, with all the resources needed to live a privileged life. Haunted by the murder of his father twenty years earlier – the perpetrators of which have never been caught – Swann has, however, turned his back on this world and chosen instead to fight crime as 'The Regency Detective', an unofficial consulting detective to the Bow Street Runners in London. Arriving in Bath for a family funeral, Swann finds several reasons for staying in the city: to protect Mary, his sister, from the mysterious Lockhart; to find the 'Scarred Man', who might lead him to his father's killer; and to end the reign of terror by Wicks, the local underworld boss who, in turn, sets out to have Swann assassinated.