Sonia Mendeleeva suspected something was wrong in the neighboring apartment. Otherwise, why hadn’t anyone seen the elderly father and his not quite healthy son for so long? Sonia wasn’t worried in vain: it turned out the neighbors were no longer alive—though the causes of death were quite natural. But then why were there double safe doors in their perfectly ordinary apartment? What treasure was she hiding? From the diary she found, Sonia understood it was a lifetime edition of poems by the famous English poet William Blake. But how did such a rare collectible end up with the neighbors, and where was it now to be found? Sonia didn’t know that together with the answers to these questions, she would also find the main man in her life…