Season 2, Episode 32
|Airdate||May 3rd, 1964|
|Starring||Bill Simpson; Andrew Cruickshank; Barbara Mullen|
|Previous||"The Spirit of Dr. McGregor"|
|Next||"The Hallelujah Stakes"|
"Mortal Sin" is the thirty second episode of season two of the British medical drama, Dr. Finlay's Casebook, and the twenty-first episode of the series overall. It was directed by George Spenton-Foster with a teleplay written by Alistair Bell. It first aired on BBC One in the United Kingdom on May 3rd, 1964.