Arctic terns migrate annually from Greenland to Antarctica. It's their nature. There are also humans, whom nature has created as wanderers—they depart for distant seas and lands, leaving those who love them to struggle with an overwhelming longing. Neither humans nor birds can know what awaits them at the end—beyond the edge of eternal ice, where the most terrible loss can turn into the most precious discovery. And yet, they strive for their final destination, no matter what obstacles stand in their way. Even if this migration is their last.