In 1938, 500 macaques were captured in India and released on a remote and uninhabited Caribbean island. How do the monkeys organize themselves socially? Troop wars, discrimination, nepotism, abuse of power or even “coup d’état” on the one hand - and maternal love, solidarity, and respect for the social hierarchy on the other. For better or worse, a society has been formed. Three renowned scientists - a psychologist, a geneticist and an evolutionary biologist - scrutinize these primates of the Caribbean in order to understand the roots of our own human society.