When South Africa’s President, Jacob Zuma, falls ill from what he suspects to be poison, he flies to Moscow for treatment. But why the need to go abroad? The implication is that Zuma believes Western spy agencies are trying to kill him. But is he now using the Russians, or are they using him for their own strategic purposes?

'Poison' is the story of one man's toxic obsession and the battle for South Africa's future.

Presenter: Andrew Harding