Doctor Who silence In The Library synopsis

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BBC press office have revealed the synopsis For episode 8 of series 4 of doctor who
Silence of the library

Saturday 24 May
6.20-7.05pm BBC ONE

One hundred years ago, the universe's greatest library was sealed off, leaving only one warning: "Count the shadows". But now, the shadows are moving again. As Russell T Davies's Bafta Award-winning time-travelling drama continues, the Doctor and Donna must uncover the terrible truth behind the Nodes and the horrifying Data Ghost, to find the library's secret.

David Tennant plays the Doctor and Catherine Tate plays his companion Donna Noble, with guest stars Alex Kingston, Colin Salmon and Steve Pemberton.Sounds great