In a country where just a third of the people believe in ghosts, Plessor is firmly in the fervent minority.
He knows some people might think he's crazy. In fact, he even pokes fun at himself: When the song "Thriller" erupted at a recent ghost investigation he coordinated, Plessor grinned as he said: "No, Michael Jackson is not here with us tonight. That's just my ringtone."
And he cheerfully admits that he might see and feel things others don't. "I am sensitive to hauntings," he said.
But Plessor, 45, has remained devoted to the supernatural, ever since July 2006 when, he said, a photograph of his family flew out of a car seat pocket on a road-trip and hovered in midair, even though the car windows and vents were closed.
Now, Plessor and his wife, Cindy, lead paranormal investigations twice a month at Fort Mifflin, hunt ghosts for free at supposedly haunted houses as members of the Norristown Area Paranormal Society and are developing a reality TV show, "Ghostly Intentions," to compete with the popular "Ghost Hunters" series on Syfy (formerly the Sci Fi Channel).
They make no money off their efforts and have sunk $25,000 into ghost-hunting gear and other costs.
Hauntings are Plessor's hobby, his passion - his religious mission, even.
"You can't see Christ, either, but we still believe in the Rapture and the second coming," he said. "I believe in the ultimate haunting called Easter. What happened on the third day? He rose! What words did Jesus say? 'Weep not, woman, go telleth all about me!' How can I refute these holy words!"
A haunted house?
On a recent balmy evening, Plessor's mission took him to Quakertown, Bucks County, where Kas and Dan Tedesco say they've lived with ghosts for years.
"Things were quiet when we first moved here [in 1985]," said Kas, 79, of the 1940s commercial garage converted to living space.
