The Lost Ninja by Jay Leibold takes YOU on an adventure through San Francisco. 9-12 year old readers will navigate the streets of San Francisco and put their ninja skills to the test. Choose Your Own Adventure The Lost Ninja is an interactive gamebook in which YOU decide what happens next. You trained in Japan to become a powerful ninja, and now your skills are needed in San Francisco. You are far from the magical dojo you once called home. But has the dojo's strange curse followed you into your new life? You recognize ruthless gangsters you've crossed paths with before. Did they follow you here? You hear rumors that priceless antiques are making their way along the same route you just traveled-will the thefts be blamed on you?