Mysterious Africa, the end of the 40s. Smart, talented Kathy Austin, a British secret agent, is dispatched to Kenya and Namibia. There, first on the slopes of Kilimanjaro, then in the Namibian desert on the Tropic of Capricorn, the young Englishwoman will make terrifying discoveries, before being sent deep into the Amazonian rainforest. What if mankind isn't the only rational species on Earth ?