Compulsion by Sahara Kelly

Rumours are circulating about Harbury Hall and the terrible disasters that have befallen those associated with it. Lady Alywnne Harbury is recovering from one such nightmare; but as her strength returns, so does her determination to exact revenge on those who tore her apart.
She plans a Winter Ball, recruiting both Charlotte Fielding and her new “companion”, one Miss Mary Jones, as assistants for the grand event. Inspector Burke and Devon Harbury are not thrilled with this development, but see no alternative but to agree.
Even with the presence of Baron Gerolf von Landau, a renowned professor of the mind, James isn’t pleased to see the women walking into Harbury Hall. If he knew what Lady Alwynne had planned, he’d be even more unsettled. It’s unlikely any of them would even believe what the Baron has in mind…
It is highly recommended that this series be read in order, to fully comprehend the story arc.

(Warning: Content may disturb some readers)