The Evil Within — S.M.. Hardy

On the brink of a breakdown, two years after the death of his fiancée, Jim Hawkes quits his high-powered job in the City to rent a cottage in the Devonshire countryside seeking some well-needed rest. But Slyford St James is far from the peaceful haven Jim was hoping for.
Almost immediately he is plagued by strange occurrences: a combination lock that won't open, loud noises in the attic, the figure of a little girl always just out of sight. His new village friends, Jed and Emma, are convinced Jim has found his way to the village for a reason, to solve the mystery surrounding the suspicious death of a child. But as Jim is haunted by the ghosts of his past and endangered by a real-world threat in the present, it soon becomes apparent that true evil never dies.