Reunited rebels Nathan, Haven, Sina and Bardou continue their journey to the Edge during which they discover that lost legends of the past may prevent two realms from tearing Nothing apart.
When her granddaughter Aria comes to stay with her, making it her mission to turn her boba café around, Jing Li, who is the secret keeper of the monster of San Francisco, is overrun with customers while Aria sneaks away to reason with the earthquake-causing monster.