Anne of Green Gables, "Anne of Avonlea," and "Anne of the Island" are a set of classic books by Lucy Maud Montgomery that tell the adventures of Anne Shirley. Anne is an orphan girl who lives at Green Gables and captures the reader's heart with her imaginative worlds and warmth. These books are filled with love, friendship, and overcoming life's challenges, making them a unique and unforgettable read.