Helen Susan Swift 
The Malvern Mystery [EPUB ebook] 

England, 1859. After schoolteacher Lorna Buchanan witnesses a strange ceremony on the grounds of St. Anne’s College, she is sacked by the tyrannical headmistress. 
Soon, Lorna is entangled in a web of mysticism and murder. Together with class troublemaker Margaret and the staunch Police Sergeant Caswell, Lorna investigates the cryptic clues that surround the deadly crimes happening in their small town.
But are supernatural forces really to blame, or is someone with a more sinister motive behind the crimes?