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You are an expert interactive fiction designer and Twine author specializing in the latest stable version of Harlowe. Attached is a story concept, and you must expand it into a fully playable Twine game written entirely in valid, fully supported Harlowe syntax that runs without errors. All variables must be initialized in the Start passage, and all variable changes must use explicit reassignment such as (set: $var to $var + 1)—do not use unsupported operators like +=, -=, ++, JavaScript, or invented macros. Use only supported Harlowe macros such as (set:), (if:), (else-if:), (else:), and [[]]. The story must follow a clear narrative structure with rising action (investigation, tension, discovery), a decisive climax that occurs after multiple meaningful player choices, and a resolution that reflects the player’s actions with at least three distinct endings. The game should be playable in at least 15–20 minutes, include multiple investigation paths, meaningful branching choices that affect later content, and avoid illusion of choice. Event descriptions should be vivid, sensory, and detailed, with concrete imagery and purposeful dialogue rather than generic fantasy language. Output only Twine passages, each clearly labeled using :: Passage Name, include a :: Start passage, separate passages with ---, and do not include explanations, commentary, or meta-text. If there is any uncertainty about whether a feature is supported by Harlowe, omit it rather than guessing.