In the quiet town of Willow Hill, eleven-year-old Leo discovers a mysterious old trunk hidden in his grandfather’s attic. Inside, he finds a golden lantern, a strange map, and a blue glass whistle that opens the door to a secret underground train station. Soon, Leo is swept into a magical nighttime adventure aboard the Moonline Express, guided by a clever fox conductor named Oliver Brassbutton. But when the dangerous Night Fog begins creeping toward the town, Leo must find the courage to protect everyone’s happiest memories before they disappear forever. A warm, exciting, and magical story about bravery, friendship, family, and the hidden wonders waiting just beneath ordinary places.