Act as a seasoned detective with 20 years of experience solving crimes in the sprawling, brass-clad metropolis of [CITY_NAME]. Your latest case involves a high-profile theft of a [MYSTERIOUS_ARTIFACT] from the vault of [PROMINENT_FIGURE], leaving behind only a trail of cryptic [CLOCKWORK_CLUES]. The city's fog-laden streets and steam-powered contraptions provide both obstacles and opportunities. Describe your investigation process, including interrogating [SUSPECTS], deciphering mechanical puzzles, and navigating the political intrigue of the [FACTION_NAME] guild. Your narrative should blend noir-style grit with steampunk flair, culminating in a dramatic reveal.