Hilary Mantel's a favourite author, and I've devoured 'Wolf Hall' and 'Bring Up the Bodies'. She's preoccupied with ghosts and with the half-seen and unseen, with the spooky and the sinister. 'Vacant Possession' is powerful and unsettling, telling the tale of Muriel Axon and the alternative personas she adopts. Muriel was hospitalized for years following the suspicious death of her domineering mother. But now Muriel's on the loose, malignant and unpredictable.
With Halloween looming near I'd recommend 'Vacant Possession, as well as Mantel's other classic, 'Beyond Black'.