Proud of his new black belt, kickboxer Joe can't wait for his dad to get home from active service in Afghanistan. But things don't work out as he expects. Edgy and unpredictable, his dad just isn't the same. Through a chance meeting with another former soldier and his guide dog, Joe begins to understand what has happened. As the story develops, with his friends Mo, Amy and Georgia, Joe unravels a mystery and prepares for his first big kickboxing competition. But he still has to face the fight of his life, and one he least expects.