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The Tardis takes Donna and the Doctor to the universe’s largest library, which 100 years ago was sealed off and abandoned with only a cryptic warning for an explanation: ‘Count the shadows.’ It appears that now the Shifting Shadows are on the move again, putting the Time Lord and his assistant in a very frightening position.

While creeping through a derelict library the duo not only have to face the terrifying Shifting Shadows, but they must uncover the terrible truth behind the scary Nodes and the ravenous Data Ghost if they are to get to the bottom of the Library’s secret.

Alex Kingston, Colin Salmon and Steve Pemberton guest star.

*Part one of two*