The Time Tunnellers find themselves in Feudal Japan where they meet the greatest samurai of all time, Miyamoto Musashi. The skillful warrior befriends the children and allows them to accompany him on his quest to fight the very best samurai in Japan. The children discover that Musashi knows of a holy man who may be able to reveal the truth about the mysterious medallions that allow them to travel through time and with this information they may well be able to find their way back home. But their journey is long and dangerous with hazards at every turn. Along the way the Time Tunnellers learn the history of ancient Japan, meet warrior monks and evil ninja who are out to get the children's medallions for themselves. As Miyamoto Musashi duels the best fighters in Japan, the children find themselves battling for their very own survival in this fast paced action adventure.