Now residing in Brooklyn, N.Y., Elizabeth Gifford enclosed a note in the package explaining that she'd recently found the book and realized it was from her high school library.
She wrote to the school librarian that she recalled the late fee on overdue books as 10 cents per day. So, she did the math.
Enclosed in the envelope with the book was a check to the Brooks High School Library for $620 - the accumulated fine since 1990.
"I couldn't believe it," Whitehead said. "She requested that the money, 'please be used for new library acquisitions.' "