Billy Stuart is a young raccoon who dreams of following in the footsteps of his grandfather, Virgil, a reckless adventurer. With him, he would cross the raging torrents, climb the mountains to the steepest peaks, and he would face the worst dangers. One day Billy receives a letter from Virgil. The letter tells him that he has discovered a way to travel in time and invited him to meet him before the big departure. Billy is stunned. How has his grandfather found a way to travel through time?