Sonia Mendeleeva suspected that something was wrong in the neighbor’s apartment. Otherwise, why have the elderly father and his not entirely healthy son been seen for so long? Sonya had good reason to worry: it turned out that her neighbors were no longer alive, although the causes of death were quite natural. But why then do their completely ordinary apartment have double safe doors? What treasure is she hiding? From the diary she found, Sonya realized that this was a lifetime edition of the poems of the famous English poet William Blake. But how did the rarest rarity get to the neighbors and where to look for it now? Sonya did not know that along with the answers to these questions she would find the main man in her life...