In the second episode of the BBC One spy drama’s tenth and final series, Calum is attacked in the street during a routine intelligence sharing exercise with MI6.

His laptop is stolen containing highly classified information on MI5’s undercover assets. The names are soon leaked, putting the assets’ lives in danger, and it’s a race against time to stop the next spy being exposed.

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Episode 2 airs at 9pm on Sunday 25th September. Here are ten teasing lines of dialogue from the episode…

» ‘She believes what she’s doing is right.’

» ‘Emotional blackmail, eh Harry?’

» ‘You put me in danger when you became a traitor…’

» ‘I’m really not that brave, you know.’

» ‘Why do I get all the bodily fluid jobs?’

» ‘Well, that was a short career.’

» ‘You lied to me!’

» ‘He’s like you, in some ways.’

» ‘You killed him.’

» ‘Our hands can’t get much dirtier, can they?’