The Ring of Water (Young Samurai, Book 5)

Young Samurai has a rapidly growing fanbase - with the second book, "The Way of the Sword", the series entered into the top 100 children's chart. This tale is set in 1613, and follows Jack Fletcher, who wakes up at a roadside inn wrapped only in a dirty kimono. He has lost his memory and only has a Ronin, a masterless samurai, to help him.