The background story of this is interesting— three men, each believing they‘re Christ, are brought together in Ypsilanti State Hospital (early 1960s). However, this is fully a case study with more detail than I wanted/needed. Plus, some of the approaches taken then would be questionable today, something that the author (who ran the study) acknowledges in his afterword penned 20 years later.
Still curious to see the movie based on this.