London, 1888. How can you be the most sought-after detective of times? How can you be a girl? How can you be blind? What if all this is contained in one person this book introduces us to? A young girl, Maria St. Clair, became the most popular detective in London and nearby countries. People young and old resort to her services, but it is not the lack of vision that is her main problem, but the man who sends ominous messages to the newspapers. As it turned out later, Maria has a companion, Asma Higints. Together, they will unravel all the mysteries of the time mechanism called Mansura. An ancient artifact that Maria had been searching for most of her life. Will the girls be able to find Mansura? And what happens if you turn back time? Will the heroines sacrifice everything for everything?