Dörtlerin İşareti

Dörtlerin İmzası (İngilizce orijinal adı: Sign of Four) Sir Arthur Conan Doyle'un yazdığı ikinci Sherlock Holmes romanıdır.

1890'da yayınlanmıştır. Sherlock Holmes ve arkadaşı Doktor Watson, Bayan Morstan’ın yıllar önce kaybolan babası ve kendisine gönderilen gizemli incilerin peşinden savaş zamanının Hindistan’ına uzanırlar. Araştırdıkları olaya bir cinayet de karışınca masum bir kadını korumak için atıldıkları macera, gitgide büyüyen bir tehlikeye dönüşür. Holmes ve Watson, Hindistan'daki sömürgelerden İngiltere'ye uzanan bu hazine avcılığının sonucunda işlenen cinayeti kimin işlediğini bulmaya çalışırlar.

g t d Sherlock Holmes kitapları
Romanlar	A Study in Scarlet (1887) The Sign of Four (1890) The Hound of Baskervilles (1902) Valley of Fear (1915)
Öyküler	A Scandal in Bohemia (1891) The Red-Headed League (1891) A Case of Identity (1891) The Boscombe Valley Mystery (1891) The Five Orange Pips (1891) The Man with the Twisted Lip (1891) The Adventure of the Blue Carbuncle (1892) The Speckled Band (1892) The Adventure of the Engineer's Thumb (1892) The Adventure of the Noble Bachelor (1892) The Adventure of the Beryl Coronet (1892) The Adventure of the Copper Beeches (1892) The Adventure of Silver Blaze (1892) The Adventure of the Yellow Face (1893) The Adventure of the Stockbroker's Clerk (1893) The Adventure of the Gloria Scott (1893) The Adventure of the Musgrave Ritual (1893) The Adventure of the Reigate Squires (1893) The Adventure of the Crooked Man (1893) The Adventure of the Resident Patient (1893) The Adventure of the Greek Interpreter (1893) The Adventure of the Naval Treaty (1893) The Final Problem (1893) The Adventure of the Empty House (1903) The Adventure of the Norwood Builder (1903) The Adventure of the Dancing Men (1903) The Adventure of the Solitary Cyclist (1903) The Adventure of the Priory School (1904) The Adventure of Black Peter (1904) The Adventure of Charles Augustus Milverton (1904) The Adventure of the Six Napoleons (1904) The Three Students (1904) The Adventure of the Golden Pince-Nez (1904) The Missing Three-Quarter (1904) The Adventure of the Abbey Grange (1904) The Adventure of the Second Stain (1904) The Adventure of Wisteria Lodge (1908) The Adventure of the Cardboard Box The Red Circle (1911) The Adventure of the Bruce-Partington Plans (1908) The Adventure of the Dying Detective (1913) The Disappearance of Lady Frances Carfax (1911) The Adventure of the Devil's Foot (1910) His Last Bow: The War Service of Sherlock Holmes (1917) The Illustrious Client (1924) The Blanched Soldier (1926) The Mazarin Stone (1921) The Three Gables (1926) The Sussex Vampire (1924) The Three Garridebs (1924) The Problem of Thor Bridge (1922) The Creeping Man (1923) The Lion's Mane (1926) The Veiled Lodger (1927) Shoscombe Old Place (1927) The Retired Colourman (1926)
Önemli karakterler	Sherlock Holmes Dr. Watson Profesör Moriarty Irene Adler Dedektif Lestrade Mycroft Holmes Bayan Hudson Mary Morstan Baker Street Irregulars
İlk basıldığı dergiler	The Strand Magazine Collier's McClure's
Yazar	Arthur Conan Doyle
Resimleyen sanatçılar	Sidney Paget Frederic Dorr Steele
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