Montgomery takes YOU on another unexpected adventure with your grandparents. Your 6-8 year old reader will visit the zip-line park and cruise through the canopy, chase after a runaway thief, and fly in a rocket ship into space! Your Grandparents Are Spies is a companion book to the bestselling title Your Grandparents are Zombies!. Choose Your Own Adventure Your Grandparents Are Spies is an interactive adventure book in which YOU decide what happens next. Is the man with a scar and a briefcase following you? Are your grandparents really who you think they are? Or, are they top-secret spies on a dangerous mission? Will you be one of the youngest space adventurers ever?