Question: What book written by Erika Mitchell was first published in April 2012?

full_context: Document 1: Cassandra Clare: Judith Lewis (née Rumelt, born July 27, 1973), better known by her pen name Cassandra Clare, is an American author of young adult fiction, best known for her bestselling series ""The Mortal Instruments".
Document 2: Fifty Shades Darker (film): Fifty Shades Darker is a 2017 American erotic romantic drama film directed by James Foley and written by Niall Leonard, based on E. L. James's novel of the same name. The second film in the "Fifty Shades" film series, it is the sequel to the 2015 film "Fifty Shades of Grey". The film stars Dakota Johnson and Jamie Dornan as Anastasia Steele and Christian Grey, respectively, with Eric Johnson, Eloise Mumford, Bella Heathcote, Rita Ora, Luke Grimes, Victor Rasuk, Kim Basinger and Marcia Gay Harden in supporting roles.
Document 3: The Sleeping Beauty Quartet: The Sleeping Beauty Quartet is a series of four novels written by American author Anne Rice under the pseudonym of A. N. Roquelaure. The quartet comprises "The Claiming of Sleeping Beauty", "Beauty's Punishment", "Beauty's Release", and "Beauty's Kingdom", first published individually in 1983, 1984, 1985, and 2015 in the United States. They are erotic BDSM novels set in a medieval fantasy world, loosely based on the fairy tale of "Sleeping Beauty". The novels describe explicit sexual adventures of the female protagonist Beauty and the male characters Alexi, Tristan and Laurent, featuring both maledom and femdom scenarios amid vivid imageries of bisexuality, homosexuality, ephebophilia and pony play.
Document 4: Fifty Shades of Grey (film): Fifty Shades of Grey is a 2015 American erotic romantic drama film directed by Sam Taylor-Johnson, with a screenplay by Kelly Marcel. The film is based on the eponymous 2011 novel by British author E. L. James and stars Dakota Johnson as Anastasia Steele, a college graduate who begins a sadomasochistic relationship with young business magnate Christian Grey, played by Jamie Dornan.
Document 5: Fifty Shades of Grey: Fifty Shades of Grey is a 2011 erotic romance novel by British author E. L. James. It is the first instalment in the "Fifty Shades" trilogy that traces the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey. It is notable for its explicitly erotic scenes featuring elements of sexual practices involving bondage/discipline, dominance/submission, and sadism/masochism (BDSM). Originally self-published as an ebook and a print-on-demand, publishing rights were acquired by Vintage Books in March 2012.
Document 6: Sandra Brown: Sandra Lynn Brown (born March 12, 1948) is an American bestselling author of romantic novels and thriller suspense novels. Brown has also published works under the pen names of Rachel Ryan, Laura Jordan, and Erin St. Claire.
Document 7: Fifty Shades of Oy Vey: A Parody: Fifty Shades of Oy Vey: A Parody by E.L. Jamesbergstein is a parody of E.L. James' "Fifty Shades of Grey". It was published in print and e-book editions by Alfred A. Knish in 2013. Described on its book jacket as "So erotic, you'll plotz," the comic novel, which follows the outline of the original "Fifty Shades of Grey", tells the story of the relationship between a beautiful young woman, Anatevka Stein, and a portly bagel tycoon, Chaim Silver.
Document 8: E. L. James: Erika Mitchell (born 7 March 1963), known by her pen name E. L. James, is an English author. She wrote the bestselling erotic romance trilogy "Fifty Shades of Grey", "Fifty Shades Darker", and "Fifty Shades Freed", along with the companion novel ""; and under "Snowqueen's Icedragon" the Twilight fan fiction "Master of the Universe" that was the basis for the Fifty Shades trilogy.
Document 9: Fifty Shades Freed (film): Fifty Shades Freed is an upcoming American erotic romantic drama film directed by James Foley and written by Niall Leonard, based on the novel of same name by E. L. James. It is the final film in the "Fifty Shades" trilogy, and a sequel to "Fifty Shades of Grey" (2015) and "Fifty Shades Darker" (2017). The film stars Dakota Johnson and Jamie Dornan as Anastasia Steele and Christian Grey, respectively.
Document 10: Emmanuelle (novel): Emmanuelle ("Emmanuelle: The Joys of a Woman") is an erotic novel by Emmanuelle Arsan originally written in French and published in France in 1967. It was translated into and published in English in 1971 by Mayflower Books. It is a series of explicit erotic fantasies of the author in which she has sex with several—often anonymous—men, her husband, and also several lesbian encounters . It is written in the third person and the reader sees events entirely through the eyes of the sexually adventurous heroine. The book sold widely and later went on to be adapted into a film. The book had two print sequels, and the film launched an extended series.
Document 11: Fifty Shades (film series): Fifty Shades is an American film series that consists of three erotic romantic drama films, based on the " Fifty Shades" trilogy by English author E. L. James. It is distributed by Universal Studios and stars Dakota Johnson and Jamie Dornan as the lead roles Anastasia Steele and Christian Grey, respectively. Sam Taylor-Johnson directed the first film and initially she was slated to be the director of the sequels as well, however subsequently the second and third films were directed by James Foley.
Document 12: Fifty Shades Darker: Fifty Shades Darker is a 2012 erotic romance novel by British author E. L. James. It is the second instalment in the "Fifty Shades" trilogy that traces the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey. The first and third volumes, "Fifty Shades of Grey" and "Fifty Shades Freed", were published in 2011 and 2012. The novel is published by Vintage Books and reached No. 1 on the "USA Today" best seller list.
Document 13: Grey: Fifty Shades of Grey as Told by Christian: Grey: Fifty Shades of Grey As Told by Christian, also referred to as Grey, is a 2015 erotic romance by British author E. L. James. It is the fourth installment in the "Fifty Shades" series, which had its start as fanfiction.
Document 14: Fifty Shades Freed: Fifty Shades Freed is the third and final installment of the erotic romance "Fifty Shades Trilogy" by British author E. L. James. After accepting entrepreneur CEO Christian Grey's proposal in "Fifty Shades Darker", Anastasia Steele must adjust not only to married life but to her new husband's wealthy lifestyle and controlling nature. The paperback edition was first published in April 2012.
Document 15: Fifty Shades (novel series): The "Fifty Shades" trilogy is a series of erotic novels by E. L. James. The trilogy consists of "Fifty Shades of Grey" (2011), "Fifty Shades Darker" and "Fifty Shades Freed" (2012). The trilogy traces the deepening relationship between a college graduate, Anastasia Steele, and a young business magnate, Christian Grey.
ground_truth: Fifty Shades Freed