After decades as the gentle-natured leader of a Christian retreat that endeavors to "cure" gay teens, Walt is packing up his life and preparing for a reluctant retirement. But when his final client quietly disappears into the remote Idaho wilderness, Walt discovers that his previously unwavering moral compass no longer points the way. With profound humanity and subtlety, "A Great Wilderness" navigates complex moral terrain, exploring the shifting motives and inconstant strength of our personal convictions.