Book 2 of the Glamourist Histories.
In which Jane and Vincent travel abroad to Belgium on honeymoon, discover a method of preserving glamour and become embroiled in The Hundred Days.
The style of the Glamourist histories is very much a gentle Regency fantasy - Austenesque with magic - though this has more glamour theory than romance compared to Book 1.
I found this an enjoyable quick read and am looking forward to the next in the series.