* '''BB: In addition to the three superb novels so far released in the Department 19 series, you recently released the Department 19 Files, 3 e-books set in the Department 19 universe between 1917 and 1919. I've read, and really enjoyed the first one, and am about to read the others - and am looking forward to more in the future, hopefully! Do you think the internet and the growth of e-readers has led to more opportunities for authors to write short stories like this?'''
WH: It's all very weird. I don't really know how successful it isDefinitely – before the rise of ebooks, as the only places I tend to stay away from could have put the D19 Files would have either been in the backs of the sales numbers – my view tends to be that as long as my publishers are happy, then I'm happy. But when I was writing itnovels, or in their own collection once I never had any idea whether it would ever even see written enough of them to warrant the light of day, let alone whether anyone would ever read itprinting costs. So if it's selling wellI love printed books, so I’d still love to do that's awesome. But what's far more awesomeone day, and endlessly humblingbut for now, is realising that there are people releasing them digitally allows me to put them out there actually spending their money and time on something I wrote. Interacting with fans of the series is the best part of the whole thing – reading their thoughts, answering their questionsquickly, enjoying their theories – and it's been lovely to hear how many of them were eagerly awaiting lets readers pick the publication of Battle Linesones they think they might be interested in.
* '''BB: And speaking of short stories, you also wrote one for World Book Day, featuring Larissa, perhaps one of the most intriguing characters in the series. (Apologies to Frankenstein; I did say I'd have changed my mind by now though!) How did you get involved in writing something for World Book Day?'''