had flippable covers and a divided spine design. In late August 2011 the second batch of releases was published with a surtitle applied to the two stories and a shared cover with a more traditional blurb for each of the two stories on the back of the books. The next batch of 2in1 stories was released in February 2012. Twelfth Doctor novels In May 2014, it was revealed that New Series Adventures would release books starring the Twelfth Doctor and Clara Oswald, which were released in September 2014. The titles of the released books are Silhouette, The Crawling Terror, and The Blood Cell. The next wave was released in September 2015, with each book under the name of the Glamour Chronicles. The stories featured were Deep Time, Royal Blood and Big Bang Generation; first two of these feature the Twelfth Doctor and Clara, and the latter marking first New Series Adventure appearance of Bernice Summerfield, alongside the Twelfth Doctor. A new wave was released in April 2017 with the arrival of Bill Potts and Nardole making a presence to prose. The stories featuring are Diamond Dogs, The Shining Man and Plague City. Thirteenth Doctor novels In July 2017, it was revealed that Penguin Random House would publish books featuring the 13th Doctor. The Good Doctor was released on 25 October 2018. Molten Heart was released on 8 November 2018. Combat Magicks was released on 22 November 2018. In 2018, it was announced that author David Solomons would write two novels featuring the 13th Doctor to be published by BBC Children's Books with the first book, The Secret in Vault 13, set to be released on 1 November 2018. The second, The Maze of Doom, was published on 30 April 2020. In 2020, actress Sophie Aldred released a brand-new novel featuring the 13th Doctor and Ace called At Childhood's End. Audio stories Starting with The Stone Rose, all of the New Series Adventures featuring the Tenth Doctor have been released as abridged audio books, normally around three months after the print publication. The first three stories in the range were narrated by David Tennant, with subsequent stories narrated by different members of the cast. In January 2010, it was decided that the stories would be released, unabridged, as download-only exclusives, and that no further stories were to be published on CD. This affected the last five Tenth Doctor novels, and continued