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Molly Butler dies from carbon monoxide poisoning. The cops believe she either killed herself or it was an accident. But when Molly's best friend Judith Kent reads Molly's diary, she discovers that Silas Butler had written a mystery story for his writing class about using carbon monoxide to kill someone without getting caught.

Molly Butler is found dead of Carbon Monoxide poisoning. The police think that it was either suicide or accidental. But Molly's best friend, Judith Kent, has other thoughts after she reads in Molly's diary that Silas Butler wrote a mystery story for his Creative Writing class about a murder using CO that was undetectable.

Silas Butler asks his correspondence school instructor, George Monroe, to listen to his idea for a murder mystery story. Monroe does, and offers a suggestion on how the murder should be committed: with carbon monoxide. After Butler finishes the story, his wife is found dead of carbon monoxide poisoning. The police explanation is suicide or accidental death, but Mrs. Butler’s best friend, Judith Palmer, is not convinced they’re right.