It was promising
I had to wonder if I read the same book as others who rated this book highly. The premise itself was not bad, and the start was promising. There was room for the story and characters to grow. But then the author decided to make the story 'cute' and make her heroines 'plucky.' At least I'm assuming this, because the characters and plot derailed.
The sisters are constantly, and I mean constantly, described by their looks and by how intelligent or, in Beatrice's case, not as intelligent (but at least loyal to a fault!). But then they behave in very unintelligent ways and have reactions that are more in line with spoiled, coddled, adolescent. Which, hey, I guess they were. But that's not how they were constantly described. Seriously, I understood clearly by the end of chapter one that Chloe was beautiful and smart and so well read, and Beatrice was plain but had grit and loyalty to spare that I didn't need it beaten into me at every opportunity.
What truly ruined the book for me, though, was the unclear direction of the novel. The story starts off as a romance, turns into a badly drawn spy mystery, and then tumbles into a farce. I kept skipping pages and finally chapters just to get to the end. I truly believe the author could have done much better with this story and it's characters.