Is it a spell book that smells like it was written in blood, not ink? Yes.
Does its cover feature what seems to be an actual face instead of a nice illustration, or the expected title & author’s name? Again, yes.
But to the question “Shouldn’t we put it back where we found it instead of reading from it during a thunderstorm in this abandoned farmhouse surrounded by farm equipment such as pickaxes and pitchforks, far from home, our cellphones dead?”
Well. I object to that question’s framing.