In the 1920s Midwest, a charming and smooth-talking salesman named Elmer stumbles upon a revivalist tent meeting led by Sister Sharon Falconer, a passionate and devout evangelist. Elmer, who is more interested in personal gain than spirituality, sees an opportunity to exploit the religious fervor for his own purposes. He impresses Sister Sharon with his persuasive oratory and quickly becomes a valuable part of her traveling religious roadshow, attracting ever-larger crowds with his fiery sermons and provocative style. Despite his dubious motives, Elmer begins to develop genuine feelings for Sharon, who sees him as a potential partner both in faith and romance.

As the revival tour gains momentum and success, not everyone is convinced of Elmer’s sincerity. Investigative reporter Jim Lefferts starts digging into Elmer’s past, suspecting that the charismatic preacher might have skeletons in his closet. Meanwhile, Elmer's relationship with Sister Sharon faces challenges from both their differing motivations and external pressures. Tensions rise as personal ambitions clash with burgeoning feelings and the scrutiny of skeptics. How the unlikely partnership between Elmer and Sharon navigates these moral and social dilemmas becomes central to their journey.