Midnight is a Lonely Place by Barbara Erskine

After a broken love affair, biographer Kate Kennedy retires to a remote cottage on the wild Essex coast to work on her new book until her landlord's daughter uncovers a Roman site nearby and long-buried passions are unleashed! In her lonely cottage, Kate is terrorized by mysterious forces. What do these ghosts want? That the truth about the violent events of long ago be exposed or remain concealed? Kate must struggle for her life against earthbound spirits and ancient curses as hate, jealousy, revenge and passion do battle across the centuries.