While excellent it felt a little rushed.
Charlotte is learning to control her magic and finding out more about the Royal Society of Esoteric Arts. Her brother Ben is training in a mill and she discovers how hard the work is and how corrupted things can get. She's dealing with her attraction to Magus Hopkins and her fiance's plans and it's quite complicated. The mystery solving felt a little rushed but the world building is worth reading it for.
Overall I want more in this world.