The Adventure of the Deptford Horror

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The Adventure of the Deptford Horror is a Sherlock Holmes story by Adrian Conan Doyle. The story was published in the 1954 collection, The Exploits of Sherlock Holmes.

Spoiler warning: Plot and/or ending details follow.

Holmes and Watson are called to the home in Deptford, due the concerns of a young woman about her safety. Several of her relatives have died in the past few years of heart attacks. A relative who trains canaries also lives in the house. Holmes is not able to detect anything amiss until he and Watson are en route home, but he suddenly solves the mystery and returns to Deptford to save the life of the young woman from a death by heart failure.