I got more than I expected from this book. It is one of those plots that is used very frequently in modern historic romance... although majority of Julia Quinn's book fall somewhere in between modern historic and historic romance....She is very clever in combining the various elements to make her books stand out from the rest. 
 Billy is your typical first born daughter who should have been born a son. She reads the latest farming books and takes part in helping her father with the daily operation and enhancement of Aubrey's farm and tenant's life. .. she basically makes the steward role useless. She also grew up running wild with 3 of her neighbors, 2 brothers and their sister. The elder brother, the heir, was not part of their shenanigans. This is Billy and George realizing their feelings for one another. 
 The book had certain class that reminded me of Julia Quinn's earlier work. I enjoyed the banter between Billy, Andrew and George. The pall mall scene made me want to go back and re-read The Viscount Who Loved Me