The year is 1348 and the Black Death is ravishing England. The Theory of Everything's Eddie Redmayne plays a monk who breaks his vows of celibacy when he falls in love with a woman. As the plague reaches their region, he urges her to flee into the relative safety of the forest. She agrees, but only under the condition he leaves the monastery once and for all. She'll wait for him at a predetermined meeting place, but only for a week. If he doesn't make a decision by then he'll never see her again.
Torn between his vows and the woman he loves, the monk prays for some sort of guidance. He takes it as a divine sign when a knight named Ulric (Game of Thrones's Sean Bean) arrives at the monastery, seeking someone who can guide his party through the difficult lands. The monk jumps at the chance as no one else knows the area better and he's swept away on a miserable and bloody adventure.
To say any more would spoil the horror. Much of the latter half verges on absurd, which would normally clash with the first half's tone, but it's a decent little flick. The unhampered violence, which stops just short of full-blown exploitation, will turn many away, but here's my problem with dismissing it as gratuitous: we live in a time when full grown adults believe the very same superstitions as the characters in The Black Death. It's much more important to show how horrific senseless violence was rather than downplay it.