Hilary Craven, amusing name since she's trying to kill herself in Morocco when the story begins, is enlisted by a British agent Jessop to impersonate a missing scientist's dead wife. Scientists have been disappearing all over the world and Jessop believes Hilary is his best hope of locating where they've been spirited off to.
I really liked the journey across Africa and the different ideologies for the characters - these made up their different reasons for disappearing the way they did. They all thought they were going to their version of Utopia. In reality a very wealthy man was collecting 'resources' that the world would pay heavily to use. Christie wasn't blinded by the illusions thrown up to stop people seeing the realities of life - in the end it's always about money. Greed makes the world go round. Quite sad really, since money doesn't exist yet so much harm is done to acquire it.
