Perry Mason: Raymond Burr
Paul Drake: William Hooper
Della Street: Barbara Hale

Sarah Breel: Margaret O’Brian
Virginia Breel: Lurene Tuttle
Pete Chenery: Leonard Nimoy

 In a shop, Virginia witnesses her aunt, Sarah Breel, an elderly Lady, attempting to steal diamonds, which is very opposite to the Lady’s character. She needs Perry Mason to defend her aunt. In this time her husband, George Breel, who owns a gem company, disappears. Perry Mason finds out that before he vanished, George has given some stones to a friend, Austin Cullens, to reset. The stones belong to one of George’s customers. 

They find Cullens dead and an empty jewelry bag. He was murdered. Coming outside they find Sarah Breel. The old Lady was hit by a car, her shoe covered with blood - and they find the missing diamonds with her. Paul Drake helps Perry Mason to make researches. They discover that Cullens has done deals, claiming diamonds being lost and cashing in the money from the insurance, betraying both, George Breel and his clients. 

Their trace leads them to Mrs. Chenery. She has claimed the loss of diamonds to the insurance, but cannot identify a picture of the stones, which proves that she's never seen them before. The moment they are confronting Mrs. Chenery her husband, Pete Chenery, comes in. Thinking that Perry Mason is Cullens, he behaves very rough towards the lawyer, accusing him of buying his wife clothing and giving her money. His envy is obvious. 

Chenery threatens him saying he will get himself a lawyer. Mason advises him to do so. Having misunderstood the situation of the lost diamonds, Sarah Breel had tried to take the blame on herself instead of her son being blamed for the loss. This explains her actions. She is relieved when Perry Mason tells her that George was innocent. In court Mr. Chenery appears as a witness, but after the hearing Perry Mason proves that he has committed the murder of Austin Cullens because of his wife's involvement in Cullen's diamond business. With all his strength he fights the people holding him, trying to blame everybody else but himself for the murder committed because of envy.