Wow - writer Alena Dmitrieva went to the library! She was pushed down the stairs and robbed. They stole... a cardboard bookmark from a book. And this is not just anywhere, but in Paris itself. It’s a pity that Alena didn’t immediately find out the true price of the thing stolen from her! Now here and there there is talk about some priceless rarity, and suspicious people in hats are hovering around the Russian lady. Surely they are competitors in search of treasures, to which the numbers inscribed on the bookmark can lead! So, you need to find her, solve the code and get ahead of everyone. Detective excitement captured the writer’s warm heart. And a strange investigation began...