Justin Playfair is a New York judge who believes he is the famed sleuth, Sherlock Holmes. When his brother and sister-in-law attempt to get him committed, he is put under the care of a psychiatrist by the name of Dr. Watson, who finds there is something very real in Justin's delusion. Together the two take to the streets of Manhattan to seek out the "detective's" arch-enemy, Professor Moriarty.
