The biggest secret in Trident City has just been revealed, and third grader Shelly Siren is completely shell-shocked. She has just discovered that she is not an ordinary mermaid; she is actually a real life royal princess. The news sends ripples of shock through Trident Academy, and suddenly everyone is treating her differently. Shelly is completely overwhelmed by her new status. She does not know if she is supposed to wear a heavy, glittering crown to class, or if she has to move out of her cozy home and into a massive, intimidating palace. Most importantly, she worries that her best friends will start treating her like royalty instead of a regular kid. This engaging chapter book navigates the difficult waters of sudden change and identity. Young readers will root for Shelly as she tries to figure out how to embrace her royal heritage without losing her true self.