In which our heroine solves problems, breaks social etiquette, is continually found by adventure and drinks tea. Lots of tea. So, basically more of the first three books. Alexia continues to impart practicality to an increasingly complex assortment of supernaturals and over enthusiastic humans. Some new information on her family's past is revealed, and the arcs of many of the secondary characters continue to build along lines that have some interesting twists to them. 
 If you've enjoyed the series so far, then you will continue to do so. This is another light-hearted journey through supernatural, Victorian London that parallels the earlier books while increasing their stories.