On the mining colony Callous, Elliot King struggles to meet the demands of its governor, Teremon. The odds are stacked against him, and his options are running low. The world that once promised dreams now offers only despair.

A wild Ood stalks the forests, carrying an antiquated phone. The caller promises much – he claims he can change the world – but he always speaks a devastating truth. He is the Master and the Ood will obey him... but to what end?

1. Call for the Dead by James Goss
2. The Glittering Prize by James Goss
3. The Persistence of Dreams by Guy Adams
4. Sins of the Father by Guy Adams

As we travel further with the Master through the Time War, there are epic implications as well as very personal stories. There’s a distinctly dark and mystical feel to some of the episodes, but ultimately we discover that the Master laid some truly dastardly plans before it all started, and that his warped ambition knows no bounds.

It’s been such a pleasure script editing this series. Working closely with producer Scott Handcock, my aim has been to create a balance of the epic and the deeply personal.

Even before we finished recording The War Master: Only The Good, Derek had told us how much he wanted to come back, and another series of brand-new adventures for the War Master got an instant green light!

We’ve some really exciting stories in store over the next three box sets, kicking off with The Master of Callous by James Goss and Guy Adams, which also features the return of the subservient Ood. It’s a grand four part masterplan, and I can’t wait for people to hear it come December!

Derek Jacobi was amazing in the first series of The War Master,” says “His Master appears at first to be a supportive and friendly Time Lord who wants to help those around him – but there is an underlying malevolent desire for carnage. Derek’s Master’s ruthless desire to win his own game at all costs makes this the Hannibal Lecter regeneration (a part Derek auditioned for) and is truly terrifying.

In my mind I’m thinking: are we really doing this? A secret shoot, with only nine people involved? Will this work? Can we reveal the new Doctor this way? Are the BBC really going to put it out during the Wimbledon Men’s Singles Final? Is it crazy? Will people even watch or notice? (Turns out, the answer to all those questions is yes).

Somewhere on a train, Jodie Whittaker is making her way towards us, having told people she’s off to make a low budget Scandinavian film this weekend.

Recce done, we hole up in a hotel. Some of us are checked in under fake names, I can’t work out whether that’s for security, or because we’re all enjoying the cloak and dagger. When I go to check in, I forget my fake name. I’m not very good at this.

The hotel is quiet. Great. As we walk across reception we notice lots of champagne glasses. The staff explain: preparations for the massive wedding reception that’s going to be happening tonight. Right. Uh-oh.

To get to the car tomorrow, Jodie will have to walk through this big reception, where the hungover wedding guests will be checking out in the morning. How do we get the new Doctor from her room to the car park, in the costume she’s wearing for the shoot, without anyone spotting? We’re just going to have to style it out.

Sunday morning. Jo Pearce (Social and Digital genius) has gone out early, done a dry run driving from the hotel to the location checking the route. And she comes back alarmed: there’s a Velothon on the route! Some of the roads are closed! Her brilliantly planned shortest possible route from hotel to location won’t work. What’s more, the car will be passing hundreds of cyclists. What if we have to stop at traffic lights? What if somebody looks in and sees the new Doctor? Hopefully Velothon cyclists will have other things to think about. We manage to smuggle the new Doctor into the back of Jo’s car. Hood up in the back, like she’s cosplaying The Matrix, sandwiched between two others.

The week rolls towards the Wimbledon final. Calls are made. Who needs to know the identity of the new Doctor before the rest of the world? Most importantly, Peter Capaldi. We set a time, I call him…