Ring of Wind (Young Samurai, Book 7), Paperback

Jack Fletcher is battling the high seas. Ambushed by the Shogun's samurai, Jack and his friends have only one hope of escape - the Seto Sea. But with ferocious storms, man-eating sharks and ninja pirates at every turn, their chosen route is fraught with danger! This is Book 7 in the blockbuster series from martial arts expert Chris Bradford.