Langbeschreibung
Just before a wealthy businessman disappears, his wife sees his face in an upper floor window above an opium den. The only suspect is a beggar who lives in the room. Holmes has to stay up all night smoking his pipe before he finds the answer to the mystery.
This book is a graded reader. The story has been retold in modern English for students of English as a foreign / second language at intermediate level (CEFR B1) and younger native speakers.
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