The dearest couple, Lev and Adeline Guglitsky, a collector of antique weapons and a teacher of Russian literature, find themselves drawn into a chain of incredible events as a result of an uninvited guest visiting their Moscow apartment. Who is he - a man or a ghost? Or maybe this is just someone’s calculated and stupid prank? In this surprisingly warm family story there is a place for everything: love, adventure, a kind smile, compassion, sadness and even a small trip to the past. And as always - brilliant style, unchanging feeling The author's inherent humor and his ironic view of the world will give the reader many wonderful moments.