Susan Hill 
The Mist in the Mirror 

A terrifying ghost story by the bestselling author of The Woman in Black.
One dark and rainy night, Sir James Monmouth returns to London after years spent travelling alone.
Intent on uncovering the secrets of his childhood hero, the mysterious Conrad Vane, he begins to investigate Vane’s life, but he finds himself warned off at every turn.
Before long he realises he is being followed too. A pale, thin boy is haunting his every step but every time he tries to confront the boy he disappears. And what of the chilling scream and desperate sobbing only he can hear?
His quest leads him eventually to the old lady of Kittiscar Hall, where he discovers something far more terrible at work than he could ever have imagined.
‘Thoroughly frightening’ Daily Telegraph
‘Chills the blood’ The Times