"Meitantei Holmes: Aoi Ruby no Maki / Kaitei no Zaihō no Maki" is a two-part anime special based on the works of Sir Arthur Conan Doyle, reimagining Sherlock Holmes and Dr. Watson in a steampunk-inspired Victorian London. The story is divided into two distinct yet interconnected cases, each exploring themes of mystery, adventure, and the pursuit of justice.

In "Aoi Ruby no Maki" (The Case of the Blue Ruby), Sherlock Holmes and Dr. Watson are tasked with investigating the theft of a rare and valuable blue ruby from a wealthy aristocrat. The case takes them through the bustling streets of London, where they encounter a network of thieves, smugglers, and corrupt officials. Holmes's keen deductive skills and Watson's steadfast support are put to the test as they unravel a conspiracy involving international jewel thieves and a secretive criminal organization. The narrative builds tension through a series of clever twists, culminating in a dramatic confrontation that reveals the true mastermind behind the theft.

"Kaitei no Zaihō no Maki" (The Case of the Sunken Treasure) shifts the focus to a maritime mystery. Holmes and Watson are approached by a sailor who claims to have discovered the location of a sunken treasure ship. However, the sailor is soon found dead under suspicious circumstances, prompting the duo to investigate further. Their inquiry leads them to a dangerous underwater expedition, where they face perilous challenges, including rival treasure hunters and the treacherous depths of the ocean. The case explores themes of greed, betrayal, and the allure of hidden wealth, with Holmes and Watson navigating both physical and intellectual obstacles to uncover the truth.

The main characters, Sherlock Holmes and Dr. Watson, are portrayed with their classic traits intact. Holmes is depicted as a brilliant but eccentric detective with an unparalleled ability to deduce details from seemingly insignificant clues. Watson serves as the loyal and pragmatic companion, providing both emotional grounding and practical assistance. The dynamic between the two characters remains central to the narrative, with their partnership driving the resolution of both cases.

The anime blends elements of traditional detective fiction with steampunk aesthetics, incorporating advanced technology and fantastical elements into the Victorian setting. This unique approach adds a layer of visual and narrative intrigue, enhancing the classic Holmesian formula. The storylines are tightly woven, with each case offering a self-contained mystery while contributing to the overarching themes of justice and the enduring appeal of Holmes's deductive prowess.