Olya Barkovskaya helps her friend, Dasha Novikova, who has become the main suspect in the murder of her husband Anton. But she will only be able to find the real culprit by deciphering a message hidden in the text of a book written by Anton. To do this, she must use the Caesar cipher. Olga discovers the key to the answer in the history of the Novikov family. Uncovering the horrifying secrets from Anton's past, Olga gets closer to the most monstrous secret that cost Anton his life.