1983: as the country goes to the polls, two 'Urban Explorers', together with a freelance journalist, break into the long-defunct Cadogan Tunnels.
But there's no way out of the tunnels - as the Doctor, Nyssa, Tegan and Turlough are about to discover when the TARDIS brings them, too, into the complex.
It's a rat trap - and they've all been caught!
- Format: CD-Audio
- Publisher: Big Finish Productions Ltd
- Publication Date: 30/06/2011
- Category: Science fiction
- ISBN: 9781844355600