The cryptographer is a good debut novel. I love the cover. Aster Tanner's feminist character is refreshing. The romance is good and pans out well.
However, the book has too many lapses of logic even for a historical romance. Eg: It didn't make a lot of sense to be celebrating and making love soon after somebody'd death. A lot of the dialogue seemed very '21st century' for a historical novel. The characters are too progressive for their era.
Aster's character also becomes inconsistent towards the end. The book begins slowly but picks up. It felt like a historical version of Mr. and Mrs. Smith at some point.
Overall, it was an enjoyable read. Lovers of historical romance with elements of thriller and suspense will like this book.
(Note: I received a copy of the book from Story Cartel. This has not affected my opinion in any way.).