Eight-year-old Princess Anna lives in Arendelle Castle with her parents and sister, who no longer communicates with her. When the king and queen leave on business for several days, loneliness and boredom completely overcome Anna. Fortunately, she was lucky enough to meet a royal messenger who gave her a great idea for fun - write a letter! And even though I had to invent a correspondence friend, it’s okay – sending mail still turned out to be very interesting. Imagine Anna’s surprise when answers to her letters began to arrive! Who writes these messages to her?