Perry Mason (1957–1966)
7 user

The Case of the Poison Pen-Pal 

Peter Gregson's aunt is murdered after she investigates a company leak that may involve Peter's old secretary, Karen Ross. Karen travels to San Francisco to see the aunt and, ultimately, is charged with her murder due to pen pal letters.


Arthur Marks


Erle Stanley Gardner (characters created by), Maurice Zimm


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Episode cast overview, first billed only:
Raymond Burr ... Perry Mason
Barbara Hale ... Della Street
William Hopper ... Paul Drake
Ray Collins ... Police Lt. Arthur Tragg (credit only)
Everett Sloane ... District Attorney
Patricia Breslin ... Karen Ross
Douglas Henderson Douglas Henderson ... Peter Gregson
Bert Freed ... Carl Holman
Wright King ... Lee Gregson
Joan Tompkins Joan Tompkins ... Florence Holman
Kathryn Givney ... Wilma Gregson
Naomi Stevens ... Agnes
Charles Cooper ... Ben Willoughby
Harry Jackson Harry Jackson ... Matt Clark
Paul Genge ... Inspector Wade


Just as they are about to merge with another company, Gregson Canneries sees its stock unexpectedly go up in price. This is bad news for the company and principal owner, Wilma Gregson, who tells president Peter Gregson to immediately go to Chicago and renegotiate the merger. Their company is nearly bankrupt and the rising price won't help. Wilma is convinced that someone leaked news of the merger and suspects Peter's former secretary, Karen Ross, who he was forced to fire due to leaked plans she put in a company car, supposedly on the orders of his alcoholic wife, in which the wife was killed. Also, Karen was involved heavily with Peter at the time. Peter is now a single parent and lives alone with his young daughter Sandra. When he learns that Sandra has leaked the merger information in letters to her pen pal, Paul Drake is brought in to investigate. Perry Mason is drawn into the case when Wilma Gregson is killed and Karen Ross is charged with her murder. Written by garykmcd

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Crime | Drama | Mystery








Release Date:

10 February 1962 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


[first lines]
Wilma Gregson: Sit down, sit down. Peter, the details of the merger between Gregson Canneries and Super Brands.
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User Reviews

A badly directed episode.
9 August 2019 | by forryjesseSee all my reviews

The main reason this episode was so bad is the director. Any episode he directed was sub Par.from beginning to end.

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