Castle Extremis is to play host to the signing of a peace treaty, but as the Doctor and Martha find out, not everyone wants the war to end - from the bestselling series of Doctor Who novels.
Justin Richards is the Creative Consultant for the BBC's range of Doctor Who books, and has written a fair few of them himself. As well as writing for stage, screen and audio, he is also the author of The Invisible Detective and Time Runners series of novels for children, and Agent Alfie for younger readers. As well as collaborating with thriller writer Jack Higgins, he writes standalone novels for older children including The Death Collector, The Chaos Code, and The Parliament of Blood. Justin lives in Warwick, with his wife, two children and a nice view of the castle.