The second edition of Mathers Last Secret is out ten years after the first edition was released. For those not in the know,  Mathers Last Secret contained all the rituals and teachings of Sam Mather's AO temple in London which was run by the sex magician Dr Edmund William Berridge. The temple was formed after the schism with the Order of the Golden Dawn and was briefly the spiritual home of Alistair Crowley. The material was collected by a member of the group and kept until his death, where they were mislabeled and end up in a Wiccan museum. The book is important because it contains the actual rituals of the AO which turned out to be surprisingly close to the original