An attempt at all costs to uncover the mystery of strange ruins, strange people leading a big game in a casino, the strange behavior of two young people and a little boy forces the heroine of the novel “The Secret” to get involved in unsafe adventures. When people die or mysteriously disappear, very strange events occur, before which Mrs. Ioanna becomes perplexed - an old tried and tested friend, the always cheerful Gutyusha, comes to the rescue. Together (though not without the help of the police) they manage to solve terrible crimes...