Sunken Kingdom Books in Order

The Sunken Kingdom books are written for younger readers, but they do not talk down to them. The setup is simple and strong: Asa and Rollo are royal children whose world has been shattered. Emperor Flood has overthrown their parents and drowned much of their kingdom, leaving the Star Lands broken and dangerous. From there, Wilkins builds a fast-moving adventure series about siblings, loyalty, magic, and the long work of trying to take back what was stolen.

The first book, Ghost Ship, gives the series its shape. Asa and Rollo learn that their baby sister Una may still be alive, and that changes everything. Instead of hiding and grieving, they set out across the drowned kingdom aboard Northseeker, an invisible ship made of mist and shadow. It is a great children's fantasy image, and Wilkins uses it well. The journey feels adventurous right away, but there is real danger under it too, because Flood's world is full of spies, monsters, and traps.

The books move quickly, but the stakes are real.

As the series continues, the quest widens. In Tide Stealers, the theft of the Moonstone Star sends Asa and Rollo after underwater pirates and into deeper secrets. Sorcerer of the Waves pushes them toward the chained sorcerer Ragni, who may know what happened to their parents. By The Star Queen, the story is heading for open confrontation, with Flood destroying innocent homes and the children forced to stop running and face him directly. Each book adds another piece of the world without slowing the pace too much.

One of the nicest things about the series is the bond between Asa and Rollo. They are brave in different ways, and the books do not forget that they are children carrying a very adult burden. Their sibling trust gives the story warmth, even when the setting turns eerie. Wilkins also scatters in magical gifts, sea creatures, giants, outlaws, and a strong northern flavour that makes the whole series feel windswept and old, even though the storytelling stays very accessible.

These are short books, but they still manage to create a world with history behind it. The drowned kingdom is not just a cool fantasy idea. It shapes every choice the characters make. Travel is harder. Safety is rare. Memory matters. So does hope.

Read the books in order, starting with Ghost Ship. They were clearly built to carry readers forward one step at a time. For children who like fantasy adventure with siblings at the centre, or for adults looking for a quick, atmospheric middle-grade series, The Sunken Kingdom is an easy and enjoyable place to start.