The ghost in the machine

A lot of people believe in ghosts. Me included, within certain parameters. I've been lucky enough to have experienced the manifestations that 'genuine' phenomena produce. On several occasions, I've had people with me who saw or felt the same things. Mostly, I'm a debunker. There's usually a simple explanation if one cares to look. However, the majority of people flee at first contact!
I worked alone in a house which seemed to possess an atmosphere of stark dread....