Moscow. Denis Viktorovich, his six-year-old grandson Denis, is brought to the old resident of the house on Karetny. Grandfather Denis tells stories to his grandson every day about his age, who lived in a completely different era. Denis's grandfather's stories become a portal to his carefree Soviet childhood in one of the Moscow courtyards. Stories come to life, and grandson Denis embarks on a journey into the past. It turns out that at any time, children have a lot in common — curiosity, spontaneity, immense love and interest in how this world works.