BBC Audiobooks have revealed the synopsis for the upcoming exclusive Doctor Who audio story, The Day of the Troll. This is the fifth audiobook in the series and is read by David Tennant. The audiobook is written by Simon Messingham, and you can read the synopsis for the story on this website below.

When the Doctor arrives on Earth in the far future, he is horrified to find the planet beset by famine and starvation. England is a barren wasteland, and scientists are desperately seeding the ground to make the crops grow again. But now it seems that something even worse is happening. Karl Baring, the owner of research facility The Grange, has been snatched away in the middle of the night. His sister Katy was with him when he vanished, but is now in catatonic shock - so it is up to the Doctor, with the help of the scientists at The Grange, to investigate. What is lurking under the old bridge, and why is it preying on people? The Doctor must find out, before it strikes again...