Lightlark by Alex Aster

Welcome to the Centennial.

Every hundred years, the island of Lightlark appears for only 100 days to host a deadly game, where the rulers of six realms fight to break their curses and win unparalleled power. Each ruler has something to hide. Each curse is uniquely wicked. To break them—and save themselves and their realms—one ruler must die.

To survive, Isla Crown must lie, cheat, and betray. Even as love complicates everything . . .