Murder at a London Finishing School — Jessica Ellicott

American adventuress Beryl Helliwell and prim and proper Brit Edwina Davenport team up once again as enquiry agents to solve a mystery at their alma mater in this historical English village mystery set just after World War I.

Neither Beryl nor Edwina are the least bit interested in attending events at their alma mater, Miss Dupont's Finishing School for Young Ladies. Their lives are very full indeed in the village of Walmsley Parva. However, when a letter arrives from Miss Dupont herself requesting their help in a professional capacity, they reluctantly pack their bags for London.
 
Upon arrival, they learn from Miss Dupont that her business has seen a steep decline since the days before World War I and that now she is concerned a saboteur is attempting to damage the school's reputation. Students have reported items missing, damaged possessions, and strange noises in the night.  Some of the girls even insist ghostly forces are at play.
 
Then a former classmate of theirs and mother of a prospective student is found dead on the school grounds. The roll call of suspects is long, and if Beryl and Edwina are to have a ghost of a chance of solving the murder, they can't rule out the possibility that Miss Dupont herself may have finished off the victim . . .