Please answer the following question: Information: - The Nancy Drew Notebooks are a series of books featuring the amateur sleuth Nancy Drew. The stories are aimed at younger readers and portray an 8-year-old Nancy and her friends in the third grade. Each book is illustrated with eight black and white drawings. The series original illustrator was Anthony Accardo, later volumes were illustrated by Jan Naimo Jones, and Paul Casale . The "notebook" in the series title refers to the "blue notebook in which [Nancy] keeps track of her mysteries and writes down what she learns". The stories end with a moral message telling the reader what Nancy has learned. The cover layout has changed and evolved throughout the series. It was initially published by the Minstrel imprint and later switched to the Aladdin imprint. The series ended with volume #69 in December 2005, and was relaunched (from volume 1) as Nancy Drew and the Clue Crew. - Girl Detective is a series replacing the long-running Nancy Drew mysteries series, which had been running since 1930, first from Grosset & Dunlap and latterly from Simon & Schuster. Stories are written in first person narrative style with Nancy herself describing all the action, and feature updated and overhauled versions of the main Nancy Drew characters. In 2013, The series was ended and a new current series called Nancy Drew Diaries was launched. - The Clue of the Black Keys is the twenty - eighth volume in the Nancy Drew mystery series . It was first published in 1951 under the pseudonym Carolyn Keene . The actual authors were ghostwriters Wilhelmina Rankin and Harriet Stratemeyer Adams . - The Stratemeyer Syndicate was the producer of a number of mystery series for children, including Nancy Drew, the Hardy Boys, the various Tom Swift series, the Bobbsey Twins, the Rover Boys, and others. - The Dana Girls was a series of young adult mystery novels produced by the Stratemeyer Syndicate. The title heroines, Jean and Louise Dana, are teenage sisters and amateur detectives who solve mysteries while at boarding school. The series was created in 1934 in an attempt to capitalize on the popularity of both the Nancy Drew Mystery Stories and the Hardy Boys series, but was less successful than either. The series was written by a number of ghostwriters and, despite going out-of-print twice, lasted from 1934 to 1979; the books have also been translated into a number of other languages. While subject to less critical attention than either Nancy Drew or the Hardy Boys, a number of critics have written about the series, most arguing that the Dana Girls' relative lack of success was due to the more dated nature of the series. - Carolyn Keene is the pseudonym of the authors of the Nancy Drew mystery stories and The Dana Girls mystery stories, both produced by the Stratemeyer Syndicate. In addition, the Keene pen name is credited with the Nancy Drew spin-off, "River Heights and the Nancy Drew Notebooks. - A pen name ("nom de plume", or "literary double") is a pseudonym (or, in some cases, a variant form of a real name) adopted by an author and printed on the title page or by-line of his or her works in place of their "real" name. A pen name may be used to make the author's name more distinctive, to disguise his or her gender, to distance an author from some or all of his or her previous works, to protect the author from retribution for his or her writings, to combine more than one author into a single author, or for any of a number of reasons related to the marketing or aesthetic presentation of the work. The author's name may be known only to the publisher, or may come to be common knowledge. - Nancy Drew is a fictional American character in a mystery fiction series created by publisher Edward Stratemeyer. The character first appeared in 1930. The books are ghostwritten by a number of authors and published under the collective pseudonym Carolyn Keene. Over the decades, the character evolved in response to changes in US culture and tastes. The books were extensively revised and shortened, beginning in 1959, in part to lower printing costs and to eliminate racist stereotypes, with arguable success. In the revision process, the heroine's original character was changed to be less assertive and more feminine. In the 1980s, an older and more professional Nancy emerged in a new series, "The Nancy Drew Files", that included romantic subplots for the sleuth. The original "Nancy Drew Mystery Stories" series started in 1930, and ended in 2004. Launched that same year, the "Girl Detective" series features Nancy driving a hybrid electric vehicle and using a cell phone. In 2013, the "Girl Detective" series ended, and a new current series called "Nancy Drew Diaries" was launched. Illustrations of the character evolved over time to reflect contemporary styles. The character proves continuously popular worldwide: at least 80million copies of the books have been sold, and the books have been translated into over 45 languages. Nancy Drew is featured in five films, two television shows, and a number of popular computer games; she also appears in a variety of merchandise sold around the world. - 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. What is the relationship between 'the clue of the black keys' and 'grosset & dunlap'?
Answer:
publisher