Emily Windsnap and the Siren's Secret

In the fourth audiobook of the beloved series, half-mermaid Emily Windsnap enjoys a seemingly perfect life on Allpoints Island, surrounded by her family and friends. However, a mission from Neptune takes them back to Brightport, where a construction project threatens the nearby mer-town of Shiprock. As Emily navigates her efforts to unite humans and merfolk, grapples with her feelings for Aaron, and confronts old foes, she discovers that her adventure is just beginning.