Takes the central role, balancing the physical danger of her undercover identity with the intellectual rigour needed to take down a financial genius .
Ros infiltrates Meynell's circle to learn his methods. She discovers he is forcing a market collapse by exploiting the Highland Life bank, which is revealed to owe £65 billion to a Russian bank with mafia ties .
Rather than just catching the financier, Ros and Harry Pearce coordinate a plan involving the Chancellor of the Exchequer. They use public declarations of government backing to trick Meynell into betting further against the bank, leading to his eventual ruin .
While "On the Brink" is the specific title for this episode, the phrase is common in recent media guides: