MIDNIGHT MASS begins with Riley Flynn (Zach Gilford) returning home to the small island community of Crockett after spending years in prison for killing someone while driving drunk. Disillusioned with his Christian upbringing and struggling with the idea of redemption, Riley moves in with his parents and little brother and reconnects with his childhood girlfriend, Erin Greene (Kate Siegel), who is eight months pregnant and also a recent returnee to Crockett. When a new priest, Father Paul (Hamish Linklater), also arrives on Crockett and takes over at St. Patrick's Church, he seems to set off a series of strange and amazing events of biblical proportions.