Justin Playfair (George C. Scott) is a retired New York judge who retreats into fantasy following the death of his wife. Believing himself to be Sherlock Holmes, equipped with deerstalker hat, pipe and cape, he whiles away his days in a homemade criminal lab where he plots to foil the dastardly schemes of elusive arch-enemy Moriarty. When his brother Blevins (Lester Rawlins) tries to have him committed to a mental institution, Playfair is assessed by psychiatrist Mildred Watson (Joanne Woodward), who becomes absorbed by his delusions. In no time at all, Dr. Watson becomes the bogus fictional detective's constant companion. What follows is a playful exploration of individuality and insanity in an alienating world, in which phantom obsessions and shared mysteries can lead to true fellowship and romance. Adapted by James Goldman (The Lion in Winter) from his own stage play, 'They Might be Giants' is a captivating Quixote for modern times.