Death of a schoolgirl / Joanna Campbell Slan.

Enhanced descriptions from Syndetics:

In her classic tale, Charlotte Brontë introduced readers to the strong-willed and intelligent Jane Eyre. Picking up where Brontë left off, Jane's life has settled into a comfortable pattern: She and her beloved Edward Rochester are married and have an infant son. But Jane soon finds herself in the midst of new challenges and threats to those she loves...

Jane can't help but fret when a letter arrives from Adèle Varens--Rochester's ward, currently at boarding school--warning that the girl's life is in jeopardy. Although it means leaving her young son and invalid husband, and despite never having been to a city of any size, Jane feels strongly compelled to go to London to ensure Adèle's safety.

But almost from the beginning, Jane's travels don't go as planned--she is knocked about and robbed, and no one believes that the plain, unassuming Jane could indeed be the wife of a gentleman; even the school superintendent takes her for an errant new teacher. But most shocking to Jane is the discovery that Adèle's schoolmate has recently passed away under very suspicious circumstances, yet no one appears overly concerned. Taking advantage of the situation, Jane decides to pose as the missing instructor--and soon uncovers several unsavory secrets, which may very well make her the killer's next target...