Women authors top list of bestselling ebooks Non-fiction titles are conspicuous by their absence. Jennifer Worth's East End nursing memoir, Call the Midwife, is the sole non-fiction title in a list dominated by adult fiction. Bestselling non-fiction titles The Hairy Dieters by The Hairy Bikers and Guinness World Records 2013 sold more than 900,000 print copies but less than 28,000 ebooks. Young adult fiction features frequently, suggesting that ebooks have attracted a younger generation of readers. The prominent inclusion of the Hunger Games trilogy and Michael Morpurgo's drama War Horse confirm this trend. The list of the bestselling ebooks of 2012 reaffirms the link between screen adaptation and commercial success of the books that inspire them. The Hunger Games, The Girl with the Dragon Tattoo, The Best Exotic Marigold Hotel and The Help are just some of the novels to have received a sales surge subsequent to their cinematic release. Many novels on the list have attracted the attention of filmmakers with the film rights to Fifty Shades of Grey, Before I Go to Sleep and Jonas Jonasson's The Hundred-Year-Old Man already sold. A total of 65 million ebooks were sold in 2012. This growth is attributable to the often cheaper price of ebooks compared with their print counterparts and intense competition for market share between retailers that has led Sony to discount the prices of some bestsellers to just 20 pence. Previously some publishing houses had been reluctant to reveal detailed sales figures: 2012 marks the first time that leading trade publishers have supplied comprehensive ebook sales. Intriguingly, Amazon appears reluctant to join the trend towards greater transparency. The Bookseller editor Philip Jones speculates that Amazon's reluctance is due to their 90 per cent market share of the UK ebook market. In the US, where Amazon's market share is around 60 per cent they are more willing to release sales figures. The figures also exclude Harry Potter ebook sales. Top 20 e-books in the UK for the year ending 2012: Position Title Author Publisher Fifty Shades of Grey James, E L Cornerstone Fifty Shades Darker Fifty Shades Freed The Hunger Games Collins, Suzanne Scholastic Catching Fire Mockingjay Bared to You Day, Sylvia Penguin Before I Go to Sleep Watson, S J Transworld Reflected in You Me Before You Moyes, Jojo Source: The Bookseller