Fyneshade by Kate Griffin

Many would find much to fear in Fyneshade's dark corridors. But not I. For it has far more to fear from me...

On the day of her grandmother's funeral, Marta discovers that she is to become governess at Fyneshade, her charge the young daughter of the owner, Sir William Pritchard.

All is not well at Fyneshade. Sir William is mysteriously absent, and his son and heir Vaughan is forbidden to enter the house. Marta finds herself drawn to him, despite the warnings of the housekeeper that Vaughan is a danger to all around him. But Marta is no innocent to be preyed upon. Guided by the dark gift taught to her by her grandmother, she has made her own plans. And it will take more than a family riven by murderous secrets to stop her...