I have been reading Chris Hallquist's UFOs, Ghosts and a Rising God, and I must say that, while I initially approached it with caution (I guess because the title makes it sound like it belongs on the shelves of a New Age bookstore), it is very well researched and written. The arguments are very strong. And entertaining, I should add. It's a discussion of the testimony-based evidence for the resurrection in light of what we know about other cults, testimony made about ghosts, alien abduction and so on.
No doubt many Biblical scholars would consider a close look at claims about ghosts and UFOs to be beneath them; but, actually, these are precisely the sort of claims they need to know more about if they are to have a genuinely balanced view of the historical evidence for the resurrection.