Pliny the Younger: Do ghosts exist?

From the early second century. The elements of the haunted house story are surprisingly familiar, and the last is impressively uncanny.
To Licinius Sura
Our leisure gives me the chance to learn and you to teach me: so I should very much like to know whether you think that ghosts exist, and have a form of their own and some sort of supernatural power, or whether they lack substance and reality and take shape only from our fears. I personally am encouraged to believe in their existence largely from what I have heard of the experience of Curtius Rufus. While he was still obscure and unknown he was attached to the suite of the new governor of Africa. One afternoon he was walking up and down the colonnade of his house when there appeared to him the figure of a woman, of superhuman size and beauty. To allay his fears she told him that she was the spirit of Africa, come to foretell his future: he would return to Rome and hold office, and then return with supreme authority to the same province, where he would die. Everything came true. Moreover, the story goes on to say that as he left the boat on his arrival at Carthage the same figure met him on the shore. It is at least certain that when he fell ill he interpreted his future by the past and misfortune by his previous success, and gave up all hope of recovery although none of his people despaired of his life.
Now consider whether the following story, which I will tell just as it was told to me, is not quite as remarkable and even more terrifying. In Athens there was a large and spacious mansion with the bad reputation of being dangerous to its occupants. At dead of night the clanking of iron and, if you listened carefully, the rattle of chains could be heard, some way off at first, and then close at hand. Then there appeared the spectre of an old man, emaciated and filthy, with a long flowing beard and hair on end, wearing fetters on his legs and shaking the chains on his wrists. The wretched occupants would spend fearful nights awake in terror; lack of sleep led to illness and then death as their dread increased, for even during the day, when the apparition had vanished, the memory of it was in their mind's eye, so that their terror remained after the cause of it had gone. The house was therefore deserted, condemned to stand empty and wholly abandoned to the spectre; but it was advertised as being to let or for sale in case someone was found who knew nothing of its evil reputation.
The philosopher Athenodorus came to Athens and read the notice. His suspicions were aroused when he heard the low price, and the whole story came out on inquiry; but he was none the less, in fact all the more, eager to rent the house. When darkness fell he gave orders that a couch was to be made up for him in the front part of the house, and asked for his notebooks, pen and a lamp. He sent all his servants to the inner rooms, and concentrated his thoughts, eyes and hand on his writing, so that his mind would be occupied and not conjure up the phantom he had heard about nor other imaginary fears. At first there was nothing but the general silence of night; then came the clanking of iron and dragging of chains. He did not look up nor stop writing, but steeled his mind to shut out the sounds. Then the noise grew louder, came nearer, was heard in the doorway, and then inside the room. He looked round, saw and recognized the ghost described to him. It stood and beckoned, as if summoning him. Athenodorus in his turn signed to it to wait a little, and again bent over his notes and pen, while it stood rattling its chains over his head as he wrote. He looked round again and saw it beckoning as before, so without further delay he picked up his lamp and followed. It moved slowly, as if weighed down with chains, and when it turned off into the courtyard of the house it suddenly vanished, leaving him alone. He then picked some plants and leaves and marked the spot. The following day he approached the magistrates, and advised them to give orders for the place to be dug up. There they found bones, twisted round with chains, which were left bare and corroded by the fetters when time and the action of the soil had rotted away the body. The bones were collected and given a public burial, and after the shades had been duly laid to rest the house saw them no more.
For these details I rely on the evidence of others, but here is a story I can vouch for myself. One of my freedmen, a man of some education, was sleeping in the same bed as his younger brother when he dreamed that he saw someone sitting on the bed and putting scissors to his hair, even cutting something off the top of his head. When day dawned he found this place shorn and the hair lying on the floor. A short time elapsed and then another similar occurrence confirmed the earlier one. A slave boy was sleeping with several others in the young slaves' quarters. His story was that two men clad in white came in through the window, cut his hair as he lay in bed, and departed the way they had come. Daylight revealed that his head had also been shorn and the hair was scattered about. Nothing remarkable followed, except perhaps the fact that I was not brought to trial, as I should have been if Domitian (under whom all this happened) had lived longer. For amongst the papers in his desk was found information laid against me by Carus; from which, in view of the custom for accused persons to let their hair grow long, one may interpret the cutting of my slaves' hair as a sign that the danger threatening me was averted.
So please apply your learned mind to this question; it deserves your long and careful consideration, nor can I be called undeserving as a recipient of your informed opinion. You may argue both sides of the case as you always do, but lay your emphasis on one side or the other and do not leave me in suspense and uncertainty; my reason for asking your opinion was to put and end to my doubts.