It’s 1944 and World War Two rages on. The sisters of St. Augustine’s, a convent on a remote Scottish island, are preparing for an incoming storm. One night a cloaked figure leaves a baby in a basket and disappears, never to be seen again.

The nuns take in the boy, and agree to look after him until the storm passes when they will take the child to the mainland for permanent care. However, after a night under their watch, unsettling things begin to happen with the newest addition to the convent. Sister Agnes (Amber Doig-Thorne) suspects the child is the spawn of Satan, causing her to be locked away for fear that she's been driven mad by the isolation.

But increasingly strange occurrences lead the sisters to question their faith and everything they believe, they wonder has Sister Agnes fallen victim to the desolation of the remote island setting or was there really weight in her suspicions?

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