This essay titled "Book 7 Preface: Recap From Prior Books of the Series," is an opening to the book Khayyami Art: The Art of Poetic Secrecy for a Lasting Existence: Tracing the Robaiyat in Nowrooznameh, Isfahan's North Dome, and Other Poems of Omar Khayyam, and Solving the Riddle of His Robaiyat Attributability, which is the seventh volume of the twelve-book series Omar Khayyam's Secret: Hermeneutics of the Robaiyat in Quantum Sociological Imagination, authored by Mohammad H. Tamdgidi. It offers a summary of prior books of the series. In the overall series, Tamdgidi shares the results of his research on Omar Khayyam, the enigmatic 11th/12th centuries Persian Muslim sage, philosopher, astronomer, mathematician, physician, writer, and poet from Neyshabour, Iran, whose life and works still remain behind a veil of deep mystery. The purpose of his research has been to find definitive answers to the many puzzles still surrounding Khayyam, especially regarding the existence, nature, and purpose of the Robaiyat in his life and works. To explore the questions posed in the series, he advances a new hermeneutic method of textual analysis, informed by what he calls the quantum sociological imagination, to gather and study all the attributed philosophical, religious, scientific, and literary writings of Khayyam. In the first book of the series, subtitled New Khayyami Studies: Quantumizing the Newtonian Structures of C. Wright Mills's Sociological Imagination for A New Hermeneutic Method, following a common preface and introduction to the series, Tamdgidi developed the quantum sociological imagination method framing his hermeneutic study in the series. The second book of the series, subtitled Khayyami Millennium: Reporting the Discovery and the Reconfirmation of the True Dates of Birth and Passing of Omar Khayyam (AD 1021-1123), was dedicated to exploring in depth the hitherto findings and controversies surrounding the dates of birth and passing of Omar Khayyam. Therein, Tamdgidi discovered the true dates of birth and passing of Omar Khayyam. The third book of the series, subtitled Khayyami Astronomy: How the Newly Discovered True Birth Horoscope of Omar Khayyam Reveals the Origins of His Pen Name and Independently Confirms His Authorship of the Robaiyat, was devoted to a close examination of Omar Khayyam's newly discovered true birth date horoscope, and what information its hermeneutic study can offer for understanding Khayyam's life and works, especially the origin, nature, and the purpose of his Robaiyat. Therein, Tamdgidi discovered the horoscope origins of Omar Khayyam's pen name and independently confirmed his authorship of a collection of robaiyat. The fourth book of the series was subtitled Khayyami Philosophy: The Ontological Structures of the Robaiyat in Omar Khayyam's Last Written Keepsake Treatise on the Science of the Universals of Existence. It was devoted to an in-depth examination of Omar Khayyam's treatise "Resaleh dar Elm-e Kolliyat-e Vojood" (Treatise on the Science of the Universals of Existence) which was written originally in Persian for keepsake toward the end of his life. The fifth book of the series was subtitled Khayyami Theology: The Epistemological Structures of the Robaiyat in All the Philosophical Writings of Omar Khayyam Leading to His Last Keepsake Treatise. It was devoted to an in-depth examination of all of Omar Khayyam's philosophical treatises written before his last keepsake treatise on the science of the universals of existence, one Tamdgidi examined already in depth in Book 4 of the series. The purpose of the study of these texts, applying the quantum hermeneutic method developed for the series, was to arrive at an understanding of the structures of the theological epistemology informing any collection of quatrains or Robaiyat Khayyam may have written in his life. The sixth book of the series, subtitled Khayyami Science: The Methodological Structures of the Robaiyat in All the Scientific Works of Omar Khayyam, was devoted to a hermeneutic study of all of Khayyam's scientific works. The study was undertaken for the specific purpose of gaining hermeneutic insights into the methodological structures of Khayyam's scientific thinking that can shed light on his literary works, especially his poetry writing. In the book, Tamdgidi shared the Arabic texts, his new English translations (based on others' or his new Persian translations, also included in the volume), and hermeneutic analyses of five extant scientific writings of Khayyam: a treatise in music on tetrachords; a treatise on balance to measure the weights of precious metals in a body composed of them; a treatise on dividing a circle quadrant to achieve a certain proportionality; a treatise on classifying and solving all cubic (and lower degree) algebraic equations using geometric methods; and a treatise on explaining three postulation problems in Euclid's book Elements. Khayyam wrote three other non-extant scientific treatises on nature, geography, and music, while a treatise in arithmetic is differently extant since it influenced the work of later Islamic and Western scientists. His work in astronomy on solar calendar reform is also differently extant in the calendar used in Iran today. A short tract on astrology attributed to him has been neglected. The present volume, the seventh book of the series, is subtitled Khayyami Art: The Art of Poetic Secrecy for a Lasting Existence: Tracing the Robaiyat in Nowrooznameh, Isfahan's North Dome, and Other Poems of Omar Khayyam, and Solving the Riddle of His Robaiyat Attributability. In this book Tamdgidi will share his updated edition of Omar Khayyam's Persian book Nowrooznameh, and for the first time his new English translation of it, followed by his careful analysis of its text. He will then visit recent findings about the possible contribution of Khayyam to the design of Isfahan's North Dome. The texts and his Persian (where needed) and English translations and analyses of Khayyam's other Arabic and Persian poems will then follow. Next, he will study the debates surrounding the attributability of the Robaiyat to Omar Khayyam, before offering the book's conclusion. [ABSTRACT FROM AUTHOR]