An impossible return a novel

It's 1967 in the Chagos Archipelago, a group of atolls in the Indian Ocean, and life is peaceful and easy for hardworking Marie. Her fierce independence and love for her home are quickly apparent to Gabriel, the handsome and sophisticated Mauritian secretary to the archipelago's administrator; it's love at first sight. As these two lovers from neighboring islands welcome a new son, Joséphin, a bright future seems possible. But Gabriel is hiding...