It's been nearly 90 years since Nancy Drew found her first hidden ... 16: The Crooked Banister (Book #48) This has one of the best covers, as it features Nancy and a robot that looks like it ...

To support her family, Benson was hired by a publishing syndicate to write 23 of the first 30 Nancy Drew books, under the pen name “Carolyn Keene.” The first book was published in 1930.