Daddy-Long-Legs by Jean Webster

When Jerusha Abbott, an eighteen-year-old girl living in an orphan asylum, was told that a mysterious millionaire had agreed to pay for her education, it was like a dream come true. For the first time in her life, she had someone she could pretend was "family." But everything was not perfect, for he chose to remain anonymous and asked that she only write him concerning her progress in school. Who was this mysterious gentleman and would Jerusha ever meet him?