The Sign of Four, by Sir Arthur Conan Doyle, was published in 1890 and was the second Sherlock Holmes novel. Sherlock Holmes is sought out by Mary Morstan, who has a mysterious case requiring a solution. Miss Morstan’s father has disappeared a few years past in suspicious fashion. After receiving mysterious annual deliveries of precious pearls she had now just been delivered a letter imploring her to meet with the sender that very night. On their way to the meeting she shows Holmes a map her father had possessed - with the words “the sign of four” written upon it…
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| Readability Method | Rating |
| Fry Estimate Dale-Chall Flesh Reading Ease Composite Grade Level Open LORE Reading Level |
6 5-6 79 (fairly easy) 6.7 Developing |