Documentary filmmaker R. Scott Cooper moves his family to Georgia after being hired to make a film about the dwindling influence of Christianity. Scott intends to make an honest film, but his producer Ballard has other plans. To “pull back the curtain,” Scott and his wife infiltrate a small group at a local church. As their relationship with the group grows, Ballard’s intentions become more clear, putting Scott and Mary in an awkward position. How will the group respond to such personal betrayal?