Ty's town is slowly becoming a ghost town, a deserted place where no one lives. Ty doesn't want to move. He doesn't want to leave behind his beloved gray pony, or his big wooden desk. Just before his family packs up for good, though, his friends Nora and Paul come to visit. Their grandfather used to prospect for gold in the town, and they've brought his ancient diary with its tantalizing clues to hidden treasure. If Ty and his friends can find the treasure in time, it may help to save the town.