In a self-running, smart house, a young and sentient Roomba listens as her owner, Harold, reads aloud to his dying wife, Edie. Mesmerized by To Kill a Mockingbird and craving the human connection she witnesses in Harold’s stories, the little vacuum renames herself Scout and embarks on a journey of self-discovery.

But when Edie passes away, Scout and her fellow sentient appliances discover that there are sinister forces in their midst. The omnipresent Grid, which monitors every household in the City, seeks to remove Harold from his home, a place he’s lived in for fifty years.

With the help of Adrian, a neighborhood boy who grows close to Scout and Harold, as well as Kate, Harold and Edie’s formerly estranged daughter, the humans and the appliances must come together to outwit the all-controlling Grid lest they risk losing everything they hold dear.