Lightlark by Alex Aster — book slip

Every 100 years, the island of Lightlark emerges to host the Centennial, a perilous game where only the rulers of six realms are invited. This event offers a final chance to break the curses that have tormented their lands for centuries.

Isla Crown, the young ruler of Wildling, a realm cursed to kill anyone they fall in love with, must navigate this deadly competition. As she lies, cheats, and betrays to survive, love complicates her mission to end her realm's suffering.

For fans of Marie Lu, Marissa Meyer, and Leigh Bardugo.