The Nancy Drew Files, or the Nancy Drew Case Files, is a detective fiction series started in 1986 and released by Simon & Schuster, New York. It is a spin-off of the original series of novels featuring Nancy Drew, with a greater emphasis on adventure, malice and romance. All the books have been written under the pseudonym Carolyn Keene. This series has been targeted at readers who are age eleven and up. With a new book released almost every month, 124 titles were released in 11 years. More than 17 million copies are in print and the books have appeared on the bestseller lists of Publishers Weekly, B. Dalton, and Waldenbooks. In 2014, Simon & Schuster started releasing this series in eBook format. Source: Wikipedia (en)