"Letters to Efimov" are letters that represent a collection of personal letters to a friend, written by an unknown author. These letters reflect the deepest thoughts, feelings and memories of the past. Each letter is a separate story that opens before the reader as a transparent window to the soul of the author. The author tenderly and honestly expresses his experiences, joy, sadness and hope, which makes this collection special and moving. "Efimov's Letters" is not only a literary work, but also a document that testifies to the importance of human feelings, which always leave a mark in the hearts and destinies of even the most vulnerable people.