The book at hand discusses the science of ʿAdd al-Fawāṣil – the science which outlines the views of the scholars of Qurʾanic verse enumeration. It is a commentary on the didactic poem entitled Naṭḥm al-Kāmil fī ʿIlm al-Fawāṣil which was composed by Maḥmūd ibn ʿAli ibn Shuʿayb al-Sharqāwī and is based on a much earlier work al-Bayān fī ʿAdd Āyī al-Qurʾān, by the erudite scholar, Abū ʿAmr al-Dānī.
Despite their being many works written in Arabic on the subject, I was unaware of any books that were written and was easily accessible to students via the English medium.