This book written by Mahdi Maghrebi, under the guidance of Ayatullah Muhammad Hādi Yusufi Gharawi, is a compilation of the text written about the lives of the 12 Imams of Shia. Every chapter of this book is about the life of one of the Shia Imams and can be read and used independently from the other chapters.
The author of the book says: "I want to note that this work is the outcome of my own individual research and was not validated by any Islamic organization; nonetheless, the content of this book is backed by authentic references."
The twelfth chapter of this book belongs to Imam al-Mahdi (pbuh). This chapter reviews the life of Imam Mahdi and provides an overview of, and answers to, common questions about his minor and major occultation.