Twins Clara and Leo, working in the clock repair attic, discover that the ceremonial silver bells for the Carillon of Wishes are silent because they are too cold to resonate, a phenomenon they recall from old stories about thermal tuning. Leo finds a small, warm brass tuning fork which, when activated, produces a single tone and causes one distant silver bell to weakly chime. Clara uses historical diagrams to trace the required energy source, linking the necessary warmth amplification to the Stardust Infusion stored in the sealed Observatory Annex. The immediate challenge shifts from polishing the silver to finding a way to safely access the Annex and use the infusion to provide the necessary thermal energy to awaken the town's acoustic system before the Solstice Chime.