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Cole and Pringle question Lynn again, and although she maintains her innocence, their certainty that she is guilty finally convinces Cam. Cam, who still refuses to believe that Lynn could be guilty, is horrified when his own inquiries reveal that she purchased the last prescription of calcium capsules administered to Polly, which had to contain the fatal dose of strychnine. Lynn readily submits to questioning, as do the Cameron servants, and the police are frustrated by the lack of evidence. The autopsy confirms that Polly died of strychnine poisoning, and Assistant District Attorney Hal Cole and homicide captain Pringle agree to investigate.
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Fortunately, Cam insisted that Polly be buried, and Fred arranges for her body to be exhumed. Cam is even more shocked when Fred comments that if Lynn is guilty of murdering Polly, she would have demanded that her corpse be cremated, which she did. On the night before Cam is to leave, however, Fred asks him to stay, explaining that when he helped Bill to write his will, Bill stipulated that Lynn could not inherit his fortune unless both of the children died first. Cam spends the following week with Doug and Lynn, and is impressed by Lynn's gentle treatment of her stepson. Stevenson, although Maggie is intrigued when Cam admits that Lynn refused to allow an autopsy of Polly's body. Cam and Fred dismiss Maggie's idea as outrageous, as does Dr. Maggie, a reporter, comments that Polly's symptoms sound suspiciously like poison, and explains that the majority of poisoning murders go undetected. Although it appears that Polly will survive, a sudden relapse kills her the next night, and the grief-stricken Cam turns to his friends, Fred and Maggie Sargent, for comfort. After spending the evening by Polly's bedside, Cam and Lynn go home, where they are greeted by Lynn's young stepson Doug, who remarks that Polly's illness is strikingly similar to that suffered by his father before his death. Stevenson is baffled by Polly's painful seizures and her cries of "don't touch my feet," but reassures Lynn Cameron, Polly's stepmother and the widow of Cam's late brother Bill, that Polly will recover. Businessman Whitney "Cam" Cameron rushes to the hospital when his niece Polly is felled by a mysterious illness.