A Detroit man is arrested and dragged away in front of his family as police use facial recognition technology to arrest a suspected thief. Unable to cope with his grief, a Canadian writer creates an AI chat-bot to reconnect with a lost loved one. A London-based stock trader uses algorithms to beat the market at its own game and sets off a chain of events that threatens the stability of the world's financial markets. In Tanzania, African park rangers use new technology to identify and catch illegal hunters.