When Will Solvit travels back in time to a Japan of the past, he lands on top of a mountain guarded by a young samurai! In this adventure packed with martial arts and cool tricks, can Will and Zoe help the samurai fight off the ninjas and keep the secret of the sacred spring? Featuring cool facts, easy to read text, and a whole lot of mysteries to solve, Will Solvit makes a great companion for middle readers ages 6-11. This is the ninth book in the Will Solvit Series - be sure to check out all 12 adventures!