The Keep
Series Episode Number: 237First Broadcast: Fri 31 Jul 2015 - ~8:00pm UTC (United Kingdom)
Running Time: 75 minutes
Recorded in The Moat Studios
For many years Sir Toby has used the Keep - the most secure and secret prison in England - to hide away incredibly dangerous threats to the country. But now two prisoners are attempting to escape - and they're not the only ones.