Now, this is the kind of historical novel I like. The time period seems to be well-researched, the flawed heroine is still likable, and the plot is twisty and interesting.
Red tells us about her life in 1730, when she was seven. She has been traveling all her life with her father, a Cornish cunningman named John Jory Jago. But he believes his life is in danger so is using an assumed name. He has taught her to read fortunes using the square of sevens, a technique passed down in her family. She knows nothing of her mother except she is dead.
They meet Robert Antrobus at an inn. He is an antiquarian who is interested in the square of sevens. Her father tries to get him to take Red, but he refuses. Red’s father dies, and Antrobus returns to take her home to Bath and adopt her.
Now named Rachel Antrobus, Red begins as a young woman to try to find out about her family. The pack of cards she has always used has a Latin slogan on it that is the motto of the rich and powerful De Lacey family. That family is engaged in a legal battle over the estate between most of the De Laceys and Lady Seabourne, a sister of Julius De Lacey who is estranged from the family. The dispute is about a codicil that Nicholas De Lacey left, leaving the bulk of his estate to his first grandchild. Lady Seabourne’s son is that grandchild, but the rest of the family claims that Nicholas burned the codicil.
Red learns enough about the family to believe that she is the daughter of a runaway marriage between John Jory Jago and Patience De Lacey. Then she finds the codicil in the tube that contained the document explaining the square of sevens and realizes she is the first grandchild.
Fairly early on, we see another point of view. Lazarus Darke is working for Lady Seabourne trying to find the codicil.
Someone breaks into the house, killing the housekeeper, Mrs. Fremantle, obviously looking for something. Then Mr. Antrobus dies. Red has reason to believe that her new guardian, Henry Antrobus, has stolen her inheritance from Mr. Antrobus, and then he sells the codicil. Red runs away from home to London.
Red finds herself a job telling fortunes at a show, an illegal activity. The show was once a joint enterprise between John Jory Jago and Morgan Trevthick. Red, who has thought her mother dead, finds out that Patience De Lacey is Lady Seabourne. She presents herself to her, but Lady Seabourne throws her out. So, Red decides to infiltrate the De Laceys as a fortune teller for Mirabel Tremaine, who she believes is her grandmother. But can she find the codicil? And how will she prove that she and John Jory Jago lived instead of both going over a cliff when she was a baby, as everyone believes?
Soon, Red realizes she has entered a nest of vipers. But are they all or only some of them vipers? It seems as if I have told a lot of the story, but there is much more to come.
What? Me Read? 
I read this last year and loved it. I’ve enjoyed all of this author’s books, but I thought this one was the best.
This is the first one of hers I have read. I liked it very much.
Now that I think about it, I probably put this one on my list because of your review.