Destroy the Day by Brigid Kemmerer

The Setting: Kandala, a kingdom deeply fractured by class divides, corruption, and a devastating sickness that can only be treated by a rare elixir made from Moonflower petals.

The Rebels and Royals: The story continues to follow Tessa Cade (an apothecary-turned-rebel) and Prince Corrick, alongside King Harristan and the rebel leader Jax.

The Climax: Following the massive cliffhangers and political betrayals of the second book (Defend the Dawn), the characters are separated, and the kingdom is on the brink of total collapse. King Harristan must fight to retain his throne, while Corrick and Tessa face dangerous new factions out at sea and within their own borders to stop a full-scale civil war and secure a fair future for all of Kandala's citizens.