Torchwood: Outside the Government, Beyond the Police. From a secret headquarters in Canary Wharf, Yvonne Hartman (Tracy-Ann Oberman) leads an army of select soldiers and scientists in the defence of the British Empire. The 21st Century is when everything changes – and Torchwood will do their duty for Queen and Country.

It’s been three weeks since the Mayor of Cardiff was killed by a shop dummy and the fight is on to see who will replace him.

Yvonne Hartman is visiting the city to retrieve an invaluable alien device. She's in charge of Torchwood One, she's saving the British Empire and she doesn't care about local politics. But she is going to find herself caught up in that fight. There’s a bloodthirsty alien stalking the streets and there’s a special offer on at the all-you-can-eat Chinese buffet.

It’s the 26th of March 2005 and it’s the day that everything changes.

Big Finish proudly present Tracy-Ann Oberman, Gareth Armstong, Rebecca Lacey, Dan Starkey and Catrin Stewart in Torchwood: One Rule, a new story by Joseph Lidster – available to buy and download today, exclusive to the Big Finish website. Listen to the trailer below:

Torchwood's return continues next month in Torchwood: Uncanny Valley, starring John Barrowman as Captain Jack Harkness. Pre-order your copy today and listen to the trailer below:

Each Torchwood release can be bought individually from the Big Finish website, with money-saving subscriptions also available. And remember, when you choose to buy this release on CD directly from Big Finish, you will also unlock instant access to a digital copy for download.