In a world of powerful superheroes and supervillains, Agatha is only a lowly detective that swore off solving crime years ago. But her past comes back to haunt her when she hears her best friend got murdered. Determined to do one last case, Agatha swears to find her best friend's killer and deliver justice once and for all, but gets thrown in for a loop when Tedros Pendragon, Endless City's #1 superhero and her true love, claims to be the killer.

Prince Tedros is sent on a voyage by his father, to capture a mermaid. King Arthur has been told that the scales on a mermaid are worth quite a lot of gold. Tedros and his crew venture to Neverland to find themselves a mermaid.