The time machine takes Sasha and Alena to London in the 19th century, where they meet the famous detective. But, participating with him in solving crimes, they understand that in reality everything happened much more complicated than described in the book. Will the girls be able to neutralize the villain and return back? And what unexpected encounters await them at the end of this amazing journey? Together with the heroes of the book, the reader will experience this exciting adventure, the ending of which will, as always, be unexpected.