About the book: 2024 / An old painting has been kept in the house of the Retters antique dealers for several decades. Nobody knows where it came from or who its author is. No one except the last offspring of this family, Christopher and Christina. One day a man comes to the Retters who passionately wants to buy a mysterious painting. He believes that it contains the key that can open the way to the greatest treasure of the parallel world. The stranger is unaware that the key has already been removed from the painting, and only those who don’t really need it can take possession of the treasure..