Fifty Shades Freed is "most discarded book" Jennifer Probst's Billionaire trilogy (The Marriage Bargain; The Marriage Trap; and the Marriage Mistake) also featured prominently. Contemporary thriller Gone Girl, by Gillian Flynn, J.K. Rowling's The Casual Vacancy, and four books about or by celebrities - Bradley Wiggins's My Time; Cheryl Cole's My Story; David Walliams's Camp David; and Dawn French's Oh Dear Silvia - also made the top 20, as did F. Scott Fitzgerald's classic The Great Gatsby - clearly enjoying a resurgence following the release of a new film adaptation. "Over the last three years our annual books left behind study has shown a decline in celebrity biographies but a rise in fiction, especially for thrillers and romantic trilogies," said Shakila Ahmed of Travelodge. She added that, despite the rise in e-readers, 22,648 books were found left behind by Travelodge guests in the last year, slightly more than the 21,786 discovered during the previous 12 months. Most discarded books 1 Fifty Shades Freed, E.L. James 2 Bared To You, Sylvia Day 3 The Marriage Bargain, Jennifer Probst 4 Gone Girl, Gillian Flynn 5 The Casual Vacancy, J.K. Rowling 6 Fifty Shades Of Grey, E.L. James 7 Reflected In You, Sylvia Day 8 My Time, Bradley Wiggins 9 Entwined With You, Sylvia Day 10 Fifty Shades Darker, E.L. James 11 My Story, Cheryl Cole 12 The Marriage Trap, Jennifer Probst 13 Camp David, David Walliams 14 Call The Midwife, Jennifer Worth 15 Before I Go To Sleep, S.J. Watson 16 The Marriage Mistake, Jennifer Probst 17 The Racketeer, John Grisham 18 The Carrier, Sophie Hannah 19 Oh Dear Silvia, Dawn French 20 The Great Gatsby , F. Scott Fitzgerald