The sign of four /
Arthur Conan Doyle ; introduction by Peter Ackroyd ; notes by Ed Glinert.
- London ; New York : Penguin, c2001.
- xxiii, 128 p. ; 20 cm.
- Penguin classics .
- Penguin classics. .
Includes bibliographical references (p. xviii).
A beautiful young woman seeks the help of Holmes and Watson when the mysterious benefactor who has been sending her a pearl each year since her father disappeared wants to meet her. Involved are a priceless hoard of Indian treasure and a murderer. whose trademark is "the sing of four.