Series 9 Episode 5 Discussion

[Hunted]

I'm with Tea Lady here. I can't see in what circumstances Ruth could be a or is 'the ultimate betrayer'. In what way would she betray the team, and why would she do this? It would be completely out of character for her, and everything we have seen in Series 9 so far.

Spoiler: show

We know from the teasers and Ian Wylie's blog in the upcoming episode 7 that they are on the grid trying to twart a hacker. In episode 7 she is attacked while trying to assist a person who is trying to report a covert operation to M15. Which leaves episode 8 which we don't yet know about. That doesn't leave alot of time for her to scheme up something bad against the team?

I stick to the theory that the ultimate betrayal was Nicholas Blake.