David issues a warning to the women who are still hiding out, but does Vikki know more than she's letting on?

After a UFO crash landed, the Sussex town of Pentworth has been cut off by a mysterious invisible and impenetrable wall - and tensions are rising.

'The Silent Vulcan' is the final book in James Follett's sci-fi trilogy of the same name.

Read by Nigel Anthony.

Abridged by Miranda Davis.

Producer: Elizabeth Allard.

Made for BBC 7 and first broadcast in 2004. Show less