If the past calls, can you ever ignore it? Should you run... or listen?
____
Ominis is right, of course. Sebastian Sallow died months ago, and she saw it happen. He's gone. Completely gone, because this is certainly not a ghost. She recalls clearly from Hogwarts: ghosts are visible, faintly tangible, capable of conversation, and some even of heated discussions.
Whatever voices reach her, whether in dreams or waking hours, they don't truly exist. It's nothing more than something perfectly normal that comes with grief, the wish that he were still alive.
....
Tonight, he receives another reminder that it's not even a ghost. He knows what ghosts look like and how they behave. ... Sebastian crouches down but makes no effort to pick up the book. Resting his palm against the polished wooden floorboards, he feels this again. The faint, rhythmic pulses, like the ghost of a heartbeat. After all this time, he knows the pattern: once the rhythm fades, all the odd sounds fall silent, too. Not forever, no, but for a while at least. Usually, it fades fast. And it's fading already. Good.