Sherlock Holmes returns to London to resume his investigative practice after a three-year absence following his apparent death at Reichenbach Falls. Holmes reunites with Dr. John Watson to solve a series of complex criminal cases that challenge the boundaries of Victorian law and logic. The narrative framework consists of a collection of short stories primarily told from Watson's perspective, documenting the duo's efforts to navigate the social and criminal underworld of London. They face adversaries ranging from common thieves to masterminds, relying on Holmes's deductive reasoning and Watson's medical and military background to resolve each mystery.

Readers and critics frequently highlight the effectiveness of the episodic format in maintaining a consistent pace across the collection. Discussion often centers on the evolution of the relationship between Holmes and Watson, particularly how the detective's return alters their established dynamic. Many observers note the precision of the period-specific atmosphere, which grounds the more improbable deductions in a tangible reality. The collection is widely regarded as a significant contribution to the detective genre, with many pointing to the balance between character development and the procedural mechanics of the investigations as a primary strength of the work.