Ajay was one of the best hackers in the world when he retired from the NSA, and a lonely life in a heavily surveilled Minnesota town hasn't dulled his skills one bit, thank you very much. When his estranged daughter knocks on his door with her two daughters in tow, he hopes it's his chance to become part of her family again.But she needs more than just a sitter for his two willful granddaughters. She needs someone to keep them safe - from who, she won't say.Before, he failed at being a father so badly that he's afraid he can never make amends. Thrust back into a world of secrecy and cyberwarfare, Ajay now must uncover what makes his granddaughters valuable - and dangerous.