We return to our classic Doctors in sequence today, after last week's jump back to tie in with Season 7 on blu-ray.

Today, we're looking at a Sixth Doctor novel that should never have existed, until another author was held up and couldn't make his deadline.

Steve Cole joins us to explain how Justin Richards approached him to write The Shadow in the Glass, and how they worked together to create one of the greatest books in the Past Doctor Adventures range.