Mother knows best. The underwater world of Natatoria is enjoying a long awaited period of peace—and with it, the merpeople’s very first chance to visit human civilization. Ash and Fin’s wedding marks the perfect opportunity for the mers to celebrate their newfound freedom. But when they return home to Tahoe to prepare, Ash’s absence from the human world has raised more than a few questions about where she’s been. When blaming fingers point to Ash and Fin as the culprits who burned down Fin’s home, even his mind-jacking mojo hasn’t stopped the authorities from issuing the happy couple an early wedding gift—a matching pair of arrest warrants. Instead of bringing their families together, Ash and Fin’s upcoming wedding drives a wedge between the very cultures they’re trying to bridge. And when their reality takes an unexpected twist, Ash realizes her dual existence comes with a hefty price. Neither her human nor her mer family understand the sacrifices they’re asking of her, and as much as she wants to please both her mer and human mothers, she knows she’s one misstep away from breaking two maternal hearts. But with humans becoming aware of the mer, Ash and Fin must scramble to save their families, their societies . . . and their love. The only thing they know for sure is that when it comes to Natatorians, old habits die hard. And a royal should never get too comfortable.