"You're looking at Act One, Scene One, of a nightmare, one not restricted to witching hours or dark, rainswept nights. Professor Walter Jameson, popular beyond words, who talks of the past as if it were the present, who conjures up the dead as if they were alive... In the view of this man, Professor Samuel Kittridge, Walter Jameson has access to knowledge that couldn't come out of a volume of history, but rather from a book on black magic, which is to say that this nightmare begins at noon."
In class, Jameson, Kittridge's colleague for twelve years and future son-in-law, reads from a Civil War journal of officer Hugh Skelton. Later, at his house, Kittridge tells Jameson he looked Skelton's photo up and found him to be a dead ringer for Jameson, down to a mole and ring. Jameson admits he is Skelton. More than two thousand years before, he paid an alchemist for the gift of immortality. Kittridge forbids Jameson to marry his daughter. Jameson convinces her to elope with him that night. He goes home to pack, and discovers a very old woman in his study. She is a wife he long since abandoned. She grabs a revolver off of his desk and shoots him. Kittridge hears the shot and rushes in, just in time to see Jameson turn to dust."Last stop on a long journey, as yet another human being returns to the vast nothingness that is the beginning and into the dust that is always the end."
Notes: The "or" between "witching hours" and "dark rainswept nights" might actually be an "and." It's impossible for me to tell by ear alone. I'll leave it the way Zicree and Cregg have it.