A relatively new, fascinating yet under researched term, Deep State used in the field of International Relations, is decoded in the book with theory and facts, as a part of the larger discourse on geo-politics and geo-strategic studies, thus filling the gaps on the subject. What does the term deep state mean? When did it become part of the international relations vocabulary? What are the driving forces behind it? Such intriguing queries are answered by tracing the idea from Indian political thinker, Kautilya in the 4th century BC, to its modern day avatar in Turkey in the 1990s.