World renowned Masonic writer A.E. Waite and his book "The Holy Kabbalah" brings the science and art of the Kabbalah to the reader in a style suited to the esoteric enthusiast. The average researcher of Kabbalah will attest to the difficulty in deciphering and teaching it's concepts. The book is 672 pages so bring a lunch it is not a quick easy read. It would probably have to be read 3 times for it's full effect. If one was to read the old testament with this treatise, your understanding of the Pentateuch would only be enhanced.
There is a multitude of books on the subject of the Kabbalah but for the true traveler there isn't a treatise that comes remotely close to the quality of this work.
Book III The Mystery of Shekinah (The Principle of Divine Motherhood, the Feminine side of Divinity). Which tells of the mystical relationship between the sacred Feminine & Masculine principles is a must read, as well as book XI The Kabbalah and Alchemy, Astrology and Freemasonry but I must forewarn, you must be "duly prepared".