In the wake of Octavio's most recent capture, Callie stays behind to seize a leadership position in Octo Canyon. Back in Inkopolis, Captain Cuttlefish and Agent 3 discover something fishy beneath Mount Nantai. And Eight, a former soldier, finds herself caught in a struggle that she wants no part of. Whether the Octoling likes it or not, her worldview is about to get an expansion.