Fitting in can be hard, especially when you're as small as Ember. He's hoping his luck changes when Lua, a kindly sea turtle, escorts him across the ocean to a school for little creatures on a wondrous island. There, Ember learns that first days can also be hard – especially when they involve fantastical cave-dwellers, ferocious storms and classmates that aren't interested in making friends.

As he struggles to adapt to his school, Ember finds himself at the heart of an otherworldly mystery, facing a strange monster from the deep. And though Ember's classmates may seem of little help, any good student knows appearances can be deceiving – and friendship can come from the most unexpected of places.