Here on Saturn, it literally rains diamonds.

For over fifteen years the crew of Kollo-Zarnista Mining Facility 27 has been extracting diamonds from deep within the atmosphere of Saturn, diamonds that help to fund the ever-expanding Human Empire. But when a mining operation goes wrong, a rescue mission must be launched to save a worker lost overboard, a worker who claims that he has seen something amongst the swirling clouds. Something that cant possibly exist.

When the Doctor and Bill arrive, they immediately find themselves caught between hostile miners, suspicious security guards and corrupt company officials as they face accusations of sabotage and diamond theft.

And below them, in the crushing atmosphere of the gas giant, something is starting to rise.

An original novel featuring the Twelfth Doctor and Bill as played by Peter Capaldi and Pearl Mackie.

Mike Tucker is an author specialising in books for children and young adults, and has written several original Doctor Who novels, a number of Merlin novelisations, and original fiction for other shared universes. He has also written numerous factual books relating to film and television, including a history of the BBCs Visual Effects Department, where he used to work.

Alongside his writing, Mike works as a Visual Effects Designer, and his company - The Model Unit - recently won a BAFTA Craft Award for its miniature effects work on the 50th anniversary Doctor Who episode The Day of the Doctor