Scarlet Assassin — Ruth Silver

Prince Aaron wants nothing to do with his father's dark dealings and sinister ways. With no choice but to choose a woman to leave the royal court, Aaron needs time to think. He evades the guards and his father's clutches on an adventure outside of the palace. But his solitude is quickly stolen away. This is the fourth book in the Gem Apocalypse series. It takes places two days before the events of Emerald Rebellion.