After a young John Paul Getty III (Charlie Plummer) is kidnapped by an organized crime regime, his devoted mother, Gail (Michelle Williams), desperately attempts to convince his wealthy grandfather, oil tycoon J. Paul Getty (Christopher Plummer) to pay the ransom. When he refuses, Gail allies herself with Getty's business manager and former CIA operative Fletcher Chase (Mark Wahlberg) to set her son free, or convince Getty to change his mind before it's too late.