can't speak to when book 7 will be available, but if you haven't read Fulcanelli's Mysteries of the Cathedrals, i would highly recommend it. it's very good, especially if you've read through the Wave/Adventure Series. the english translation (translated by Mary Sworder) contains the prefaces to the first, second and american editions, and an introduction by Walter Lang. the ISBN is 0-914732-14-5