This is one of those middle grade novels that is very much written for children, and possibly won't work as well for adults: I didn't get terribly much out of it, but it is the kind of thing I might give my 7yo sisters! The mystery was fun (if obvious), though the ending  was very abrupt and everything seemed to get wrapped up rather too fast. I did enjoy Jane's character - even though she read quite a bit older than her supposed 13, both in her own actions and the way other people treated her (e.g. there was a moment where she mentioned that she wasn't invited to a ball because she was from a poor family... even though a 13 year old never would have been anyway, regardless of social class!) - and I liked all the references to her real-life family and her letters! However, all the side characters were fairly one-note (especially the villains, which made the mystery even more obvious).

Thank you to Lion Fiction and NetGalley for sending me a copy of this in exchange for an honest review