In this volume it is Mr. O'Donnell's aim to try and show, that certain spirit entities, on the Other Side, take so keen an interest in what goes on in this Material world that they not infrequently intervene, either directly, that is to say, by adopting some auditory or visual phenomena, or indirectly, through the medium of a dream. The book is divided into two sections entitled: Ghosts That Are Helpful; and Ghosts That Are Harmful.