""Ann Sheridan and the Sign of the Sphinx"" is a thrilling adventure novel written by Kathryn Heisenfelt. The story follows the protagonist, Ann Sheridan, a young girl who embarks on a dangerous journey to uncover the mystery of the Sign of the Sphinx. Ann's father, a famous archaeologist, has gone missing while searching for the sign, and Ann sets out to find him with the help of her friend, Sam. Together, they travel to Egypt, where they face numerous...