Keys to the Kingdom of Alchemy is a decoding of the chemical reaction encrypted in Basil Valentine's The Stone of the Great Philosophers - The XII Keys. This new interpretation primarily addresses operative alchemy. Apart from operative aspects however, a tremendous amount of rich allegorical storytelling and masterful conceptual blending reveals the author of The XII Keys to have been a highly educated polymath fluent in not only alchemy but also Christian mysticism, Greco-Roman mythology and Perennial Philosophy. Such a complete package in a single author is certain to be of interest to professional researchers and alchemy enthusiasts.