Set on a remote Scottish island during World War II, this gothic convent horror follows a cloaked figure who leaves a mysterious infant at an isolated monastery. As a storm rages, the nuns take in the baby—only for paranoia, demonic visions, and violent hysteria to seep into their sacred refuge

Från IMDB:
A baby in a basket is left on the steps of an isolated monastery on a Scottish island. The nuns take it in, planning to care for it until a storm passes. Soon though, strange and unexplained events begin to happen at the convent.