The Priory of the Orange Tree (Roots of Chaos #1) Samantha Shannon

A world on the brink. A queen without an heir. An ancient evil stirring beneath the sea.

For a thousand years, the House of Berethnet has kept the realm of Inys safe—but Queen Sabran the Ninth must produce a daughter to continue the line, even as assassins close in.

At court, Ead Duryan serves as a lady-in-waiting while secretly wielding forbidden magic to guard the queen’s life. Across the sea, Tané has trained since childhood to become a dragonrider, only to face a choice that could shatter everything she’s fought for.

As East and West teeter on the edge of war and long-sleeping forces awaken, three women must decide how much they’re willing to sacrifice to keep their world from burning.