The work of a textologist is akin to the work of a detective. The book of the researcher of creativity Mikhail Bulgakov, the famous textologist Lydia Yanovskaya included works written in different years, but, unfortunately, remained unknown to the general reader. Many years of study of the writer's life and work, work on manuscripts, friendship with Bulgakov's widow, Elena Sergeevna, led Yanovskaya to create an amazing book filled with valo-famous facts and textual discoveries.