According to the author, within these pages is the adventure John Dee and Edward Kelley should have had but never did.
This is a fun, occult/alchemy-based tale of Dr. John Dee, who arrives home to his burnt home to find a letter from his good friend Rabbi Judah ben Loew in Prague. It seems that there is a book that the rabbi wants Dee to guard with his life, for it contains the secret formula in cypher to bring about the mating of Lilith and Samael (Satan) and bring forth an eon of doom and destruction. But to his horror, Dee discovers that the book has been stolen and taken away from England. Back Dee, Kelley and their wives go to Prague to retrieve the book before the world becomes doomed.
Fun, fast-moving story; after all the stuff I've been reading lately this book was a breath of fresh air and a pleasant way to spend a couple of afternoons.
If you want a good old-fashioned adventure tale based on the occult, try it.