Dissension in Brazzaville ! Apostle Médard, a well known healer, is accused of witchcraft. When he isn't looking for mermaids, he spends his time exorcising the faithful from his parish...

Under the four eyes of Hadrien La Vapeur, the experimental filmmaker and former assistant to Philippe Garrel, and of anthropologist Corto Vaclav, a destabilizing  portrait of mystical Africa, that Jean Rouch would have approved.