"Self-destruct has been activated; detonation will occur in sixty seconds…" The fifth planet in the OS-3476 system was thought to be a dead world. Caris sends Windrider to study that planet. Startreader is diverted from its return to Earth when Windrider fails to report progress. They discover one important thing-the automated, coded message: Compromised. Jerry's and Kelvin's friends are on that ship. The boys want answers. They board Windrider and find the ship overtaken by an alien AI ready to destroy it…with them aboard. Escaping a runaway fusion reactor is only one problem the mind-brothers must solve. Where are their friends? Where is Windrider's crew? What happened to the race that once lived here? Most of all, how can they keep an alien computer from killing them? Join Jerry and Kelvin as they explore a new world, experience alien technology, and discover the true meaning of Windrider's Legacy…