Diana, is an ethnic Armenian, but was born and lives in Moscow. The goal-oriented and ambitious girl is completely immersed in science and is not going to tie herself down with family obligations, preferring free relationships to marriage and children. Being a specialist in ancient history, she is writing a dissertation on the role of women in the Old Testament and dreams of becoming the youngest doctor of historical sciences among women. To work on her doctorate, Diana flies to Yerevan, where she accidentally finds a riddle in one of the manuscripts that leads to the disclosure of the location of Noah's Ark. The scientist goes on a dangerous adventure and the charming swindler Avet and the policeman-art critic Ruben are forced to be her companions. In parallel with the trio, representatives of the ancient Order arrive in search of the shrine, so Diana's task is not only to find the relic, but also to get ahead of the adepts.