After being charged with hacking into the Pentagon security system, computer-whiz Josh Martin is kidnapped during house arrest and delivered to a shadowy criminal known as Charles Keller. Requested to hack into the state’s highly advanced electrical system and shut it down, it’s clear what Keller wants—total chaos. When California goes dark, he gets what he wants. And tonight, no one will be prepared for what’s about to happen.

The close-knit Walker family deals with struggles and triumphs.