For Sarah, Jago, Aisling, Maccabee, Shari, An, and Hilal, Endgame has reached its final phase. The third key, Sun Key, is all that stands between one Player saving their line—or perishing along with the rest of the world. And only one can win.

West Bengal, India: Maccabee is Playing to win. He has Earth Key and Sky Key and he is determined to find Sun Key. But in Endgame, fate can turn in the blink of an eye. He must Play carefully. He must watch his back.

Kolkata, India: An Liu is Playing for death. His goal: stop Endgame, and take the world down with him.

Sikkim, India: For Aisling, Sarah, Jago, Shari, and Hilal, their mission is to stop Endgame. Sun Key must not be found.

No matter what they’re Playing for, all of the remaining Players have one thing in common: they will end the game, but on their own terms.

• YA Dystopian Series Finale: The world ends in three days. For Players like Sarah Alopay and Maccabee Adlai, the only way to save their people is to find the final key before a meteor strikes.
• Global Scavenger Hunt: From the crowded streets of Kolkata to the remote Himalayas, the hunt for the Sun Key is a brutal, worldwide contest where every Player is both hunter and hunted.
• Enemies to Allies: Some players, like Jago Tlaloc and Aisling Kopp, have abandoned the goal of winning. Their new mission is to stop Endgame entirely—even if it means fighting former rivals and the game’s mysterious alien architects.
• Ancient Alien Conspiracy: The enigmatic kepler 22b is watching every move. But as the Players defy the rules, the line between gamemaster and participant begins to blur, revealing the terrifying truth behind the game.