A team of ninjas descends upon Pawston in this fourth Rider Woofson adventure! When the sacred scroll of Bark-Jitsu disappears, the Sensei goes to his student Westie for help. Can Westie and the rest of the Pup Investigators Pack expose the truth before the scroll disappears forever? With easy-to-read language and illustrations on almost every page, the Rider Woofson chapter books are perfect for emerging readers!