What's a Ghost to a non-believer?

The Soot family don't believe in ghosts, which is ironic because they are ghost hunters, they have a show where they act like ghosts are haunting houses... It's a lie. That is until they find a haunted orphanage where no one goes, so like any clearly mentally ok family the move in. Things go wrong and they find things aren't as they seem, a boy named Tommy, and a murderer that they dream of.

(pic not mine)
{OG story????}