I love Lewis’s book and it really isn’t a “danger, high voltage” work. It’s a perfectly logical (and funny) script about how tempting devils might approach humanity, being bent on evil and being quite obtuse to goodness. Hell is, is a sense, a very ridiculous place. I know nothing about the other books. People should be very careful if attempting to address the angelic/demonic world directly, but there’s nothing wrong with wisdom in dealing with that world’s side effects.