柯南道尔编著的《福尔摩斯探案全集之血字的研究·四签名》收录了《血字的研究》和《四签名》两个故事，给读者呈现一个冷静、智慧与勇气并存的神探福尔摩斯。匪夷所思的事件，扑朔迷离的案情，心思缜密的推理，惊奇刺激的冒险。伟大的侦探，永远的福尔摩斯。这个身材瘦削、头戴猎帽、肩披风衣、口衔烟斗的神探形象已经深入人心。福尔摩斯探案是探案小说永远的经典之作、顶峰之作。

A Study in Scarlet

Part1

 Chapter 1 Mr.Sherlock Holmes

 Chapter 2 The Science of Deduction

 Chapter 3 The Lauriston Garden Mystery

 Chapter 4 What John Rance Had to Tell

 Chapter 5 Our Advertisement Brings a Visitor

 Chapter 6 Tobias Gregson Shows What He Can Do

 Chapter 7 Light in the Darkness

Part2

 Chapter 1 On the Great Alkali Plain

 Chapter 2 The Flower of Utah

 Chapter 3 John Ferrier Talks with the Prophet

 Chapter 4 A Flight for Life

 Chapter 5 The Avenging Angels

 Chapter 6 A Continuation of the Reminiscences of John Watson, M.D.

 Chapter 7 The Conclusion

The Sign of Four

 Chapter 1 The Science of Deduction

 Chapter 2 The Statement of the Case

 Chapter 3 In Quest of a Solution

 Chapter 4 The Story of the Bald-Headed Man

 Chapter 5 The Tragedy of Pondicherry Lodge

 Chapter 6 Sherlock Holmes Gives a Demonstration

 Chapter 7 The Episode of the Barrel

 Chapter 8 The Baker Street Irregulars

 Chapter 9 A Break in the Chain

 Chapter 10 The End of the Islander

 Chapter 11 The Great Agra Treasure

 Chapter 12 The Strange Story of Jonathan Small