Perry Mason: Season 5, Episode 20

The Case of the Poison Pen-Pal (10 Feb. 1962)

TV Episode  |   |  Crime, Drama, Mystery
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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.



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Title: The Case of the Poison Pen-Pal (10 Feb 1962)

The Case of the Poison Pen-Pal (10 Feb 1962) on IMDb 8.1/10

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Episode cast overview, first billed only:
Lt. Tragg (credit only)
District Attorney
Patricia Breslin ...
Karen Ross
Douglas Henderson ...
Peter Gregson
Carl Holman
Wright King ...
Lee Gregson
Joan Tompkins ...
Florence Holman
Kathryn Givney ...
Wilma Gregson
Charles Cooper ...
Ben Willoughby
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)  »

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Technical Specs

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Aspect Ratio:

1.33 : 1
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User Reviews

Pen-pal letters lead to murder
16 August 2012 | by (United States) – See all my reviews

With Gregson Canneries on the verge of merging with Superbrand a problem comes up with the stockholders of the Gregson company. Seems that the merger has been leaked out and someone is buy the Gregson stock making it worth more than the company can buy it back. Gregson Company will either have to renegotiate the merger or go bankrupt. The main goal for the bossy manager Aunt Wilma Gregson, is to find out who on the board is leaking the information.

Peter Gregson, the single parent nephew of Aunt Wilma, has been in the dog-house ever since having a relationship with his ex-secretary named Karen Ross. Aunt Wilma believed that Ms Ross wanted much more than just being a secretary in the company. And Aunt Wilma made Peter fire her.

Aunt Wilma tells Greg to fly to Chicago to take care of the matter. But before flying out, he finds that his daughter has been writing pen-pal letters to another young girl in Chicago. Seems that the daughter has been relating information about the merger in the letters. And with Paul Drake's help, they find out that the girl in Chicago is good friends with Karen Ross.

It is not long before Aunt Wilma is killed and all the evidence points to the former secretary Ms Ross. But Perry will be there defending Ms Ross in court for the murder charge which occurs outside of LA.

With hiding information from Perry and a courtroom scene that produces damaging evidence, Perry will have his hands full defending Ms Ross. The case against Ms Ross begins to unravel when Perry discovers more than just pen-pal letters were leaking out of that company.

There's a lot of suspects to choose from in the mystery but your first guess will more than likely be correct. Maybe not the best mystery in the series but it holds up well due to the actors.

5 of 6 people found this review helpful.  Was this review helpful to you?

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