I'm not a fan of ghost tourism books like this unless the stories have some more substance beyond the typical tall tales repeated over and over. I picked this book up for a read because I had a familiarity with several of the places mentioned. It's unimpressive. I've no doubt the stories in here are typical ghost folklore but they remain just stories, unsubstantiated. There are no references or notes linked to the claims. It's short and not comprehensive at all. I guess the best you can say is that it's not as amateurish as the hundreds of cookie-cut books like this. I didn't notice any typos, though I did wonder at Ms. Guiley promoting herself as "PhD". I did not find information about this but I suspect that the degree is in a metaphysical or unorthodox subject area. I find it distasteful for authors to use letters after their name just to seemingly boost credibility.
Also, I found it jarring that Eastern State Penitentiary was referred to as an eight-petaled "flower", an analogy I've never heard used and that seems incredibly inappropriate considering the history and current function of the facility.
I found Guiley's Encyclopedia of Ghosts and Spirits to be useful at times but am not a fan of her work. It's far too credulous, speculative and unsupported. And, generally boring - same old stories, nothing else.