In the smog-choked alleys of Victorian London, a grieving tinker and a street-smart pickpocket unearth a plot to cripple the city’s beating heart of steam and iron. Armed with ingenuity, grit, and a mechanical arm that sparks more than trouble, they race through shadowed tunnels and treacherous betrayals to mend a fractured legacy—proving that even in a world of rust and ruin, one defiant gear can turn the tide.