I'd approach 'To Kill a Kingdom' with tempered expectations if you're a deep-cut fantasy reader. It's fun, but it's much more of a slick, YA fantasy-romance hybrid than a hardcore world-building epic. The pitch—a siren princess must steal the heart of a siren-hunting prince—is deliciously dark, but the execution leans into banter, enemies-to-lovers tension, and a fast pace. The oceanic world feels painted in broad strokes; you get pirate ships and cruel underwater courts, but don't expect intricate magic systems or political machinations.
Where it truly shines is in the dual-perspective narration between Lira and Elian. Their voices are distinct, sharp, and full of wounded pride, which sells the central dynamic. The prose has a vicious, glittering quality that fits the siren mythology perfectly. It's a standalone novel, which is refreshing, and it wraps up cleanly. Worth the read if you want something propulsive with a Gothic fairy-tale vibe, but maybe not if your shelves are stacked with Malazan or Sanderson.