Thomas Hawkins escaped from the gallows at the end of the last book in this series, The Last Confession of Thomas Hawkins, but Queen Caroline is still holding a threat over him—her knowledge that his beloved Kitty is a murderess. The Queen has received a request for help from John Aislabie, who has been threatened by mysterious letters. But Aislabie was the mastermind behind the South Sea Company scam, and the Queen fears that he did not destroy the green ledger of its accounts, which would show how much the Crown gained from the scam while so many others were ruined. So, she sends Thomas ostensibly to help Aislabie but really to search for the ledger. He takes with him Kitty, who now poses as his wife, and his dangerous ward, Sam Fleet.
In Yorkshire, he finds Aislabie behaving like a victim of the South Sea scandal instead of its perpetrator, claiming he took the fall for more important people. Yet he seems to have plenty of money, which he is spending on his horses and his grounds. He is not well liked, claiming common land as his own and proclaiming as poachers the families that have farmed and hunted it for centuries. In fact, Thomas finds no lack of suspects for the nasty threats Aislabie has received.
Another strange situation concerns Mrs. Fairwood, who is living with the Aislabies. She has presented herself as his daughter, thought to have been killed in a house fire thirty years before. As her bona fides she has brought along a letter from a servant who disappeared on the day of the fire and a brooch that belonged to Aislabie’s first wife, who also died in the fire. Mrs. Fairwood is also being threatened.
This is another excellent mystery/thriller in this series with its scapegrace hero and heroine. The series books always seem carefully researched and the settings authentic. The ending is quite suspenseful.