A young boy and his older sister have left home to play a game. To win, they must travel across endless lands together and make it to the finish line. Each child imagines what might be waiting for them across the border: A spotted dog? Ice cream! Or maybe a new school. But the journey is difficult, and the monsters are realer than they imagined. And when it no longer feels like a game, the two children must still find a way to forge ahead.