Those whom God wishes to destroy he first makes mad... The convent of Our Lady of Mercy stands alone in an uninhabited part of the Spanish sierra. Its inhabitants are devoted to God, to solitude and silence; six women cut off from the world they've chosen to leave behind. Everything changes on the day that a suitcase punctured with air-holes is discovered on the convent steps. Soon Mother Superior Maria Ines finds that the box and its contents are to have consequences beyond her imagining, and that even in her carefully protected sanctuary she is unable to keep the world, or her past, at bay.