After quitting his job to develop an engine, River Steelarm's relentless research pushes his wife to leave him. Evicted and struggling, he finds refuge in his repair shop with help from a loyal friend. Just then, experts confirm his breakthrough and rush to recruit him. When a risky repair job for a local gang leader backfires, an unlikely alliance of officials and global executives steps in. Choosing to build a homegrown brand, River transforms a derelict factory into the foundation of a dream.