Children's Laureate writes Doctor Who ebook Puffin Books have been publishing the 11-part series as ebooks every month since January 23, with the final installment due to arrive on November 23, the date of the Eleventh Doctor's anniversary adventure. A teaser for the book says that upon encountering these friendly Daleks, the Doctor, "ever suspicious of his arch-enemies' motives, learns of a threat that could literally tear the universe apart." Blackman said of the seventh Time Lord: "I've always found Sylvester McCoy's Doctor fascinating because of the way his character developed from a bit of a clown to a Doctor with a more Machiavellian streak. In my story, the Doctor's actions are responsible for a universal catastrophe which forces him to face up to his own fears and prejudices. Blackman will appear in a video about The Ripple Effect on YouTube on July 11. This afternoon Prince Charles and the Duchess of Cornwall will confront a Dalek on a visit to the Doctor Who set in Cardiff, as part of the 50th anniversary celebrations. There they will meet members of the Who cast and crew, including Matt Smith, who plays the Timelord, and Jenna Coleman, his companion, as well as showrunner Steven Moffat.