Pilot and Skye, two Arctic tern babies, are about to start their first incredible migration from the Arctic to the Antarctic. The flock is ready and it's time to go when suddenly Skye cannot be found. Her worried parents search everywhere but she has simply disappeared. The family must leave with the flock or risk facing the long and difficult journey alone. Will they ever see their lost baby again? Follow their exciting and sometimes dangerous pole-to-pole migration to find out.