The Small Hand by Susan Hill
Late one summer’s evening, antiquarian bookseller Adam Snow is returning from a client visit when he takes a wrong turn. He stumbles across a derelict Edwardian house, and compelled by curiosity, approaches the door. Standing before the entrance, he feels the unmistakable sensation of a small cold hand creeping into his own, ‘as if a child had taken hold of it’. At first he is merely puzzled by the odd incident but then begins to suffer attacks of fear and panic, and is visited by nightmares. He is determined to learn more about the house and its once-magnificent, now overgrown garden but when he does so, and while travelling in search of a rare book, he receives further, increasingly sinister, visits from the small hand.