The Bookseller has revealed that Doctor Who and Torchwood star John Barrowman will be co-writing a new children’s sci-fi/fantasy book with his sister, Carole E. Barrowman.

The novel will be aimed at 9-12 year olds and will be published by Buster Books in August 2011. It will follow the story of a 13 year old twin brother and sister. John and Carole have previously written a Torchwood comic together, as well as both of John’s autobiographies.

The website also reports that John will be writing a forthcoming Torchwood novel.