Silently, digitally, a boy takes apart your family

Tom's a regular teenager ? sullen, anxious, super-smart, feeling safe within his bedroom and wedded to his screen.

On a packed train, a London commodities trader gets under his skin.

The trader's got a fine wife, two kids, a yappy dog, big house, annual bonus. Tom hacks him. The trader's hardware becomes stuffed with dangerous, damaging images. Call it collateral damage.

Hacking is what Tom does. He's got control of the keyboards of key players in the fossil fuel industry. If he doesn't bring down the grid, who will?

Roads and trainlines lead the main players to a violent confrontation in the brutalist surrounds of London's Barbican Centre. Government agents work to prevent a global blackout. Tom's set to save the planet.

Who will win?