Teenager Riley's mind headquarters is undergoing a sudden demolition to make room for something entirely unexpected: new Emotions! Joy, Sadness, Anger, Fear and Disgust, who’ve long been running a successful operation by all accounts, aren’t sure how to feel when Anxiety shows up. And it looks like she’s not alone.

In a city where fire, water, land and air residents live together, a fiery young woman and a go-with-the-flow guy will discover something elemental: how much they have in common.

In an era when terrifying beasts roamed the seas, monster hunters were celebrated heroes. None were more beloved than the great Jacob Holland. But when young Maisie Brumble stows away on his fabled ship, he's saddled with an unexpected ally. Together they embark on an epic journey into uncharted waters and make history.