Reddit mentions of The Divine Guide in Early Shi'ism: The Sources of Esotericism in Islam

Here's a list of the key books in the field that I'm familiar with (by name and general contents, I've only actually read a few of them). I'm mainly focusing on what is relevant to the study of Twelver Shi'ism; there aren't many English language books on Zaidism, as far as I'm aware, and for Isma'ilism you can start with the works of Farhad Daftary.

I'll start with important works providing an overview of the area, and then give a rough breakdown by "era" (I may be a bit off regarding the era, and many of these books straddle two or more eras, so be warned). This list does not emphasize geographic studies of Shi'ism in various areas and countries, and rather traces the "core narrative" of the development of Shi'i intellectual history, which is typically thought of as happening in what is now modern day Iran, Iraq, and (especially in the post-Mongol/pre-Safavid era) Lebanon, and to a lesser extent in Bahrain. Once you've read the initial works, you should have a good idea about what's going on in each era, and you can pick and choose what to read based on your interests.

If you have no background in general Islamic history, you should first pick up a book on that subject. Tamim Ansary's Destiny Disrupted is an accessible non-academic book on general Islamic history (with an entertaining audiobook read by the author). If you want something heavier and more academic, Marshall G.S. Hodgson's The Venture of Islam is the classic three-volume reference in the field of Islamic studies, although it's a bit dated, especially in the third volume (covering the so-called "Gunpowder Empires"). Note that the standard introductory text on Shi'ism has long been Moojan Momen's book An Introduction to Shi'i Islam: The History and Doctrines of Twelver Shi'ism, but this book is now a bit dated. Heinz Halm also has some surveys, but I'm less familiar with these; likewise for the surveys of Farhad Daftary (who is better known for his work on Isma'ilism than general Shi'ism).

Surveys, Background, and Introduction

• Najam Haider's Shi'i Islam: An Introduction. This is a unique take on introducing Shi'ism that starts with what makes Shi'ism theologically distinct; the book also devotes roughly equal attention to the Zaidi, Isma'ili, and Twelver branches of the faith.
  
• Hossein Modaressi's An Introduction to Shi'i Law: A Bibliographical Study. Chapter 4 provides a very concise, yet fairly thorough overview of the history of the development of Shi'i legal theory; Chapters 1-3 can be read as "optional" background, while the rest is a bibliographical overview that is unlikely to be of interest to a non-specialist.
  
• Andrew J. Newman's Twelver Shiism: Unity and Diversity in the Life of Islam, 632 to 1722. A solid history of Twelver Shi'ism from its beginnings to the end of the Safavid period.
  
• Roy Mottahedeh's The Mantle of the Prophet: Religion and Politics in Iran. While ostensibility an intellectual history of Iran spanning centuries, this is a great introductory look at various aspects of Shi'ism, particularly as it concerns learning in the seminaries.
  
  The Succession and the so-called "Rashidun" Era
  
  
• Wilfred Madelung's The Succession to Muhammad: A Study of the Early Calpihate
  
• S.M.H. Jafri's The Origins and Early Development of Shi'i Islam
  
  The Imams and Early Shi'is in the Ummayid and `Abbasid Eras
  
  
• Arzina Lalani's Early Shi'i Thought: The Contribution of Imam Muhammad Al-Baqir
  
• Najam Haider's The Origins of the Shi'a: Identity, Ritual, and Sacred Space in Eighth-Century Kufa
  
• Maria Massi Dakake's The Charismatic Community: Shi'ite Identity in Early Islam
  
• Hossein Modarressi's Crisis and Consolidation in the Formative Period of Shi'ite Islam: Abu Ja'far Ibn Qiba Al-Razi and His Contribution to Imamite Shi'ite Thought. Considered the standard book on the "rationalist/moderate/shortcoming" view of Imamate.
  
• Mohammad Ali Amir Moezzi's The Divine Guide in Early Shi'ism: The Sources of Esotericism in Islam. Considered the standard book on the esoteric / "High Imamology" view of Imamate.
  
• Jasim M. Hussain's The Occultation of the Twelfth Imam (A Historical Background)
  
• Andrew J. Newman's The Formative Period of Twelver Shi'ism: Hadith as Discourse Between Qum and Baghdad
  
• Meir M. Bar-Asher's Scripture and Exegesis in Early Imami Shiism
  
  The Buyid, Seljuq, and Mongol Eras
  
  
• Martin J. McDermott's The Theology of al-Shaikh al-Mufid (d. 413/1022)
  
• Devin J. Stewart's Islamic Legal Orthodoxy. Some people have reservations about this book, so you might want to look at some reviews. It covers the Shi'i school of Shaykh Tusi engaging in juristic legal borrowing from the Shafi'i Sunni school, if I'm not mistaken.
  
• Etan Kohlberg's A Medieval Muslim Scholar at Work: Ibn Tawus and His Library. This is perhaps a little different from most other books on this list in scope, style, and focus.
  
  The Safavid Era and the Scholars of Jabal Amil
  
  
• Rula Abisaab's Converting Persia: Religion and Power in the Safavid Empire
  
• Robert Gleave's Scripturalist Islam: The History and Doctrines of the Akhbari Shi'i School
  
  The Iranian Interregnum Era
  
  
• Zachary M. Heern's The Emergence of Modern Shi'ism: Islamic Reform in Iraq and Iran
  
• Robert Gleave's Inevitable Doubt: Two Theories of Shi'i Jurisprudence. This is definitely worth a look if you're interested in details concerning Shi'i legal theory proper.
  
  The Qajar Era
  
  
• Hamid Algar's Religion and State in Iran 1785-1906: The Role of the Ulama in the Qajar Period. This book is about fifty years old now, but I think it's still the standard reference for this topic.
  
• Meir Litvak's Shi'i Scholars of Nineteenth-Century Iraq: The 'Ulama' of Najaf and Karbala'
  
  The Contemporary Era / Miscellaneous
  
  
• Liyakat Nathani Takim's Shi'ism in America. I said I'd stay away from the more geographically focused books, but I think this one in particular might appeal to a lot of people; mainly those living in the West in general, and North America in particular.
  
  
• Linda S. Walbridge's The Thread of Mu'awiya: The Making of a Marja' Taqlid. A book with a strange title about the foremost Shi'i scholars in the contemporary age; while published posthumously in the 2010s, the book is based on research conducted in the 1990s. I think it contains a lot of valuable information and an interesting perspective, but I also find some of it to be informed by lazy misconceptions or generalizations, although I'm quite sure the author would have substantially reworked this project had she lived longer.
  
• Ata Anzali's Mysticism in Iran: The Safavid Roots of a Modern Concept. This should provide information on irfan.
  
• Kamran Scot Aghaie's The Martyrs of Karbala: Shi'i Symbols and Rituals in Modern Iran. This covers the evolution of the Karbala narrative in Modern Iran (in the Qajar, Pahlavi, and post-Revolutionary eras, respectively).
  
• Matthew Pierce's Twelve Infallible Men: The Imams and the Making of Shi'ism. This book examines how the genre of the biographies of the Imams was formed (this may be a better fit in one of the above categories, but I'm less familiar with this book, so I'm not sure which era(s) is/are the focus).