The cartoon features Daffy Duck as the dim-witted detective Dorlock Homes (a parody ofSherlock Holmes) and Porky Pig as his sidekick Watkins (Dr. Watson), as they attempt to locate and apprehend the dangerous "Shropshire Slasher."
In London, Dorlock Homes resides on Beeker Street (a parody ofBaker Street). Engaged in "deductive reasoning" related to tax deductions, Homes receives a telegram from the Shropshire Slasher, a notorious criminal. Determined to apprehend him, Homes and Dr. Watkins visit a pub where the Slasher frequents. Despite Holmes' bumbling attempts, it's Watkins' polite interrogation that convinces the Slasher to surrender. However, a misunderstanding arises when Homes accuses a flower seller of operating without a license, unaware that she is the Slasher's mother. In the end, the Slasher voluntarily turns himself in, leaving Homes to quip about his "elementary" detective skills learned in elementary school.
Animation historianJerry Beck writes, "Deduce, You Say is an outrageously witty film that parodies both the original Sherlock Holmes books by Conan Doyle and the Hollywood movie versions ... The premise allowed [Chuck] Jones to combine Daffy's frantic animated action with Porky's subtle attitudes, facial expressions, and posing, which get just as many laughs. A class act, and a first-rate cartoon."[3]
^Beck, Jerry; Friedwald, Will (1989).Looney Tunes and Merrie Melodies: A Complete Illustrated Guide to the Warner Bros. Cartoons. Henry Holt and Co. p. 291.ISBN0-8050-0894-2.