The Grand Roundhouse is huge. Fillbert loves steam trains. He knows every single model. Today is the grand opening. But the schedule suddenly changes. A red sign flashes: CEREMONY DELAYED! The crowd buzzes and groans. The noise swells like an ocean wave. Fillbert's tummy twists tight. He hates sudden changes. He pulls out his big green noise-cancelling headphones. He slips them on. Then he counts softly. One. Two. Three. Four. Five. Six. Seven. Eight. Nine. Ten. His shoulders relax. The museum director shouts across the hall. The prize 1888 Golden Engine is missing! Fillbert can find it.