The Sign of the Four

If you want a Victorian mystery that mixes youthful stakes and a tangled origin case, start with Arthur Conan Doyle's The Sign of the Four, where Holmes and Watson confront a puzzle of stolen treasure and a dangerous pact. Fans of Young Sherlock looking for period-era plotting and a detective partnership at the story's core will find the book's India-linked intrigue, pearl clue, and conspiracy-driven investigation an immediate next read.

Presented as Watson's account, the novel follows Mary Morstan's strange inheritance and the hunt for answers that tie robbery, colonial-era politics, and personal history together.