"Ash's dad has just returned from war, close to breakdown, far from the war hero Ash was expecting. Ash is going to be the stag boy in the annual Stag Chase. He's been waiting to tell his dad he's following in his footsteps, he'll make him proud. But Dad is stuck in a world of imaginary threats. When Ash's grieving best friend pushes him away too, his world suddenly seems lonely and threatening. So Ash retreats to the mountains, to his punishing training...