Two summers ago, Allie and Dylan exposed the secret underwater city of Oceania. Now the Above World and Oceania are once again united but that's all about to change. The Great Plague has resurfaced and spread through the land-dwelling world. To protect Oceania, all outsiders are barred from the city, but not before Dylan sneaks Allie in to protect her. Unable to risk infection by returning home, Allie is forced to find a place in the highly academic society of Oceania. While the Above World scrambles to find a cure to the deadly plague, Allie struggles to find her place in the community that she's illegally become a part of. Will she be able to find her place amongst the Oceanians or will the perfection-based haven be too much for her to handle?
Full of adventures to rival the first book, Allie's Return continues with riveting undersea action and exploration that will immerse you in the world of Oceania and leave you wanting more.