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.

Features

• Comprehension and vocabulary tasks
• Summary of the story
• Endnotes for difficult words, place names and cultural references
• Word list at the end of the book