For thos who are interested in the 'hidden side' of nature, might well find this book a worthwhile read, as it covers a great deal of ground in Theosophy with the help of Madame Blavatsky's insights and travels to much unknown territory and far-reaching lands at the time of her writing this in the 1880's.
Many of her anecdotes about the hidden side of human nature and powers dealing with shamanism and magic are extremely interesting, though, it is not always possible to really define a reality with an illusion given the varying situations she describes. In one instance of a native being asked to stand up and be shot by experienced riflemen - one at point blank range - upon being fired at, the rifle blew up and the target escaped any injury whatsovever!
There are some irritations where the typeset has clearly been altered, leaving some page annotations at the end of sentences, not related to those in the book. If it was intended as cross referencing subject matter, elsewhere in other books by Ms. Blavatsky, then you will find you'll get lost!
However, I would recommend it as a good overall introduction (if perhaps a long one) to occult matters, it will certainly conjure up your imagination and perhaps spook you in places. Read it then put it in your Library for look-ins from time to time. Enjoy.