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28× in this editiona small crown worn by a noble person
Original-edition reading analysis
The twelve-story structure and clear mysteries make this one of the most approachable originals here, although Victorian legal, household, and social vocabulary still requires support. Our recommendation for the complete original is Strong B1 to B2.
Updated

Short answer
A strong B1 learner can attempt individual stories with dictionary support, while B2 is the comfortable level for the complete collection. Its through-B2 coverage is high, and each mystery supplies a fresh, limited context. The main difficulty is not constant rare vocabulary but the importance of occasional historical terms to a clue.
Vocabulary profile
The bars show the share of running word tokens—not the share of unique dictionary entries. Common words repeat often, so token coverage is the more useful signal for how frequently a learner may meet unfamiliar language while reading.
These are TeakReader frequency-based vocabulary bands, not official CEFR assignments for every word or an official CEFR certification of the book. They are most useful as comparative reading signals.
Beyond the percentages

Useful words to preview
These manually reviewed words recur in the analyzed edition and are more useful to prepare than one-off names. Counts are case-insensitive and include the exact form shown.
a small crown worn by a noble person
an official who investigates certain deaths
an opening or device that allows air to circulate
an older spelling of “clue” used in this edition
covers fixed outside or inside a window
a long bench in a church
a dress or historical outer garment
hair growing on the sides of a man’s face
a dishonest or dishonorable person
historical courts held periodically in English counties
A practical reading plan
Transparent methodology
We downloaded the UTF-8 plain-text edition from Project Gutenberg ebook 48320, removed the standard Gutenberg header and footer, lowercased English word tokens, and matched them against the same ranked frequency data TeakReader uses for vocabulary analysis. We then combined token coverage with editorial review of syntax, narration, dialect, historical context, and wordplay.
Vocabulary coverage is informative but not a complete readability score. Research on reading comprehension commonly distinguishes knowing most running words from understanding every sentence; syntax and background knowledge still matter. See this Cambridge overview of lexical coverage research for context.
FAQ
We recommend Strong B1 to B2 for the original text. The twelve-story structure and clear mysteries make this one of the most approachable originals here, although Victorian legal, household, and social vocabulary still requires support. This is an editorial estimate based on vocabulary coverage and literary features, not an official CEFR rating.
It ranks 4 of 24 in our list of classic books by reading level (1 = easiest): approachable in short episodes. A reader who knows the B1 word bands knows about 96.63% of the words in the original text, and 97.92% at B2.
A strong B1 learner can attempt individual stories with dictionary support, while B2 is the comfortable level for the complete collection. Its through-B2 coverage is high, and each mystery supplies a fresh, limited context. The main difficulty is not constant rare vocabulary but the importance of occasional historical terms to a clue.
Publishers often combine, shorten, or rewrite Holmes cases for A1–B1 learners. This page analyzes all twelve original stories in the improved Project Gutenberg ebook 48320.
We analyzed the Project Gutenberg plain-text edition (48320) against TeakReader’s English frequency list. The analysis found 101,488 word tokens and 7,963 unique forms after removing Gutenberg’s header and footer. Proper names, dialect spellings, inflections, and tokenization can affect the result.
Yes. The edition analyzed here is available free from Project Gutenberg. TeakReader can search Project Gutenberg books and add them to a vocabulary-focused reading library. Availability can vary by country because copyright terms differ.