Lucía and her son live isolated from society in a flat place where there’s practically no life. The small family unit formed by mother and son hardly ever receives visitors, and their goal is to lead a quiet existence. At first they succeed, but the appearance of a mysterious, violent creature that starts stalking their small house will put the relationship that unites them to the test.

In 1917, outside the parish of Fátima, Portugal, a 10-year-old girl and her two younger cousins witness multiple visitations of the Virgin Mary, who tells them that only prayer and suffering will bring an end to World War I. As secularist government officials and Church leaders try to force the children to recant their story, word of the sighting spreads across the country, inspiring religious pilgrims to flock to the site in hopes of witnessing a miracle..