I have loved all 5(?) of Patricia C. Wrede's books that I have read, so when this deal was posted on Dear Author, and when the commenters had such effusive praise for the book, I absolutely had to get it. It was well worth the getting. 
 Set in regency London, in a world where magic exists alongside the church and all the trappings of English society that we know of, the story unfolds in letters two cousins, Cecelia and Kate send to each other about their lives, since they are separated for the summer. In their correspondence, magic is discovered, nefarious plots are thwarted, and love is found. 
 It took a few chapters to warm up to the epistolary format and the characters, but once I did, I had a lovely time. The language is perfect for that time, and I could not help loving Cecy and Kate. Their characters, especially Cecy's remind me of Ms. Wrede's trademark no-nonsense, very practical, quite awesome heroines. And by heroines, I mean Cimorene, who is made of complete awesome :D. 
 In the afterword, Ms. Wrede and Ms. Stevermer say that they didn't discuss the plot with each other, which makes the seamlessness of the events in the letters even more remarkable. 
 I second the praise from the Dear Author coomenters. This book was great!