Question: What is the title of Erika Mitchell's novel that reached number 1 on the "USA Today" best seller list?
Context: Chuck Wendig is an American author, comic book writer, screenwriter, and blogger.  He is best known for his popular online blog Terribleminds, and for his 2015 "Star Wars" novel "", which debuted at #4 on "The New York Times" Best Seller list and #4 on "USA Today"'s best seller list.  As of early 2016, Wendig writes "Hyperion" for Marvel and "The Shield" for Dark Circle Comics. 1636: The Kremlin Games is a novel in the 1632 series written by Gorg Huff and Paula Goodlett along with Eric Flint.  It is the fourth book in the series to be listed on the New York Times Best Seller list for hardcover fiction.  This book reached number 30 on the NY Times list during a single week in June 2012.  Besides being listed on the NY Times Best Seller list, 1636: The Kremlin Games was also listed on the Locus Hardcovers Bestsellers List for the month of September in 2012 at number 6. 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. What to Expect When You're Expecting is a pregnancy guide, now in its fifth edition, written by Heidi Murkoff and Sharon Mazel and published by Workman Publishing.  Originally published in 1984, the book consistently tops "The New York Times" Best Seller list in the paperback advice category, is one of "USA Today"s "25 Most Influential Books" of the past 25 years and has been described as "the bible of American pregnancy".  s of 2008 , over 14.5 million copies were in print.  According to "USA Today", 93 percent of all expectant mothers who read a pregnancy guide read "What to Expect When You're Expecting".  In 2012, "What to Expect When You're Expecting" was adapted into a film released by Lionsgate. 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. Lauren Kate is an internationally bestselling author of young adult fiction.  Her books have been translated into over thirty languages and include "The Betrayal of Natalie Hargrove" and "Fallen", which reached number 3 on the "New York Times" Best Seller List for children's chapter books on January 8, 2010, remaining there throughout April 2011.  Fallen's sequel Torment entered the NYT Best Seller List at number 1. A Wolf at the Table is a 2008 memoir by Augusten Burroughs that recounts his turbulent childhood relationship with his father.  In the summer of 2007, Burroughs announced on his official website that the book would be released on  29, 2008 (2008--) .  In an interview with "Wikinews", Burroughs said that many of his fans may have trouble with the book.  "A Wolf at the Table" spent six weeks on the "New York Times" Best Seller list, reaching number 2 in its first week.  It also reached number 9 on the "Wall Street Journal"'s Best Seller List. "Women Who Run With the Wolves: Myths and Stories of the Wild Woman Archetype" is a book by Jungian analyst, author and poet Clarissa Pinkola Estés, Ph.D, published in 1992 by Ballantine Books.  It spent 145 weeks on The New York Times Best Seller list over a three-year span, a record at the time.  .  Estés won a Las Primeras Award from the Mexican American Women's Foundation for being the First Latina on the "New York Times" Best Seller list.  The book also appeared on other best seller lists, including "USA Today", "Publishers Weekly", and "Library Journal". Seizure is a 2003 novel by American author Robin Cook which explores the concerns raised by advances in therapeutic cloning.  It debuted at Number 6 on The New York Times Best Seller list on August 3, 2003.  It remained on the best seller list for three weeks.  In November 2004 it appeared on the paperback best seller list. Kill the Messenger is a suspense thriller by author Tami Hoag.  The hardcover edition of the novel was first published in July 2004.  In March 2006 the book was released in mass market paperback.  That same month the paperback edition rose to No. 1 on The New York Times Best Seller List, No. 3 on the Top New Books List published in Canada's "National Post", and No. 4 on the USA Today Best Seller List.
Answer: Fifty Shades Darker