In this book, its author, Dr. Mustafa Mahmoud, tries in his style known as ease and extreme logic in understanding the theory of relativity of the physicist Albert Einstein so that it suits the understanding and perception of the general public, and in a strong objection to limiting information to a few scientists under the pretext of depth and specialization, which may lead to the isolation of science, supporting in his book what Einstein himself called for to spread science among people, Einstein hated scientific fortune-telling and fabrication of mystery, claim, and magnification, and he used to say that the truth Never mind.

The Mystery of Death is a book by Mustafa Mahmoud in which he discusses death through a scientific and philosophical vision, and believes that death and life are two sides of the same coin, we die every day, as millions of cells die inside our bodies without us feeling them, and this is called the smallest death, and the book is divided into chapters such as the puzzle, the thread, time and the soul.