Nathan's Kingdom is about a young autistic man (Nathan) struggling with his teenage opiate-addicted sister (Laura), and together they risk their lives to find a fictitious kingdom with the potential of changing their lives forever.

10 years after a global economic collapse, a hardened loner pursues the men who stole his only possession, his car. Along the way, he captures one of the thieves' brother, and the duo form an uneasy bond during the dangerous journey.