Pieretta Dawn Book order (chronological)

Leilah, an amnesiac orphan, and Nathair, a jaded young boy working in the black markets to help support his sick mother, are normal teenagers leading tough lives on the Pacific island of Mondreside. Quite suddenly, their existences are intruded upon by a mysterious figure: Ora Seabright. Thus begins their journey as Mermaid Apprentices - hybrids-in-training preparing themselves to become interspecies Ambassadors between the human race and the Merfolk. They are immediately thrown into a world of political espionage, where dealing with illegal interspecies smuggling and conflicts with the notorious Merfia are only the tip of their iceberg of dilemmas. The Apprentices' largest test comes when the Mernister's daughter is kidnapped, and it is up to them to put aside their differences and resolve the problem before it's too late.