The film centres around the monastery of Tibhirine, where Trappist monks lived in harmony with the largely Muslim population of Algeria, until seven of them were beheaded in a still unclear incident in 1996.
The film focuses on the time leading up to their death
The ever-deteriorating security situation means that they are urged by both the civilian and military authorities and by Islamic militants to flee their monastery.
But should they abandon their mission or is it their duty to continue serving the local population, whatever the risks to their own safety?
Their mission is not to proselytise on behalf of their Catholic faith. Instead, led by their abbot Brother Christian, they actively engage with the local community, by running a free medical clinic and taking part in Muslim celebrations