Many years ago, when she was travelling with the Doctor, Jo Grant visited Zayin Eight. Now, suddenly and inexplicably, she is back on that ravaged planet, and reunited with a human called Newton Calder. What happened to the missing members of Calder's team? What is the secret of the vast ruined city? The answers will lie in the dark and distant past of the Time Lords themselves...
The story was initially released exclusively to readers of Doctor Who Magazine, with a given to download the story for free. It began with an introduction by Nicholas Briggs giving a brief history of the company's audio releases. This expired on 14 October2009.
Part One of this story ends with a literal cliffhanger.
The story was originally a two-part story and presented this way in the original download version. When the story was made commercially available as part of The Companion Chronicles: The Specials box set in August2011, it was re-edited as a single, feature-length story, possibly due to the story's length.