About the book: 2023 / What to do if your friend calls in the middle of the night with the words “I’m in trouble,” and then disappears altogether? Look for him, of course. What to do if a moment's haste leads to a series of events for which you feel responsible? Look for a solution. The main character of this story, Maria Streltsova, will not only have to find a friend, but also find out the secret of a mysterious letter, in which, in fact, there is nothing important, but the person died, and certain people want to get that very letter…