Ambassador Mahit Dzmare arrives in the center of the multi-system Teixcalaanli Empire only to discover that her predecessor, the previous ambassador from their small but fiercely independent mining Station, has died. But no one will admit that his death wasn't an accident—or that Mahit might be next to die, during a time of political instability in the highest echelons of the imperial court. Now, Mahit must discover who is behind the murder, rescue herself, and save her Station from Teixcalaan's unceasing expansion—all while navigating an alien culture that is all too seductive, engaging in intrigues of her own, and hiding a deadly technological secret—one that might spell the end of her Station and her way of life—or rescue it from annihilation.

An alien armada lurks on the edges of Teixcalaanli space. No one can communicate with it, no one can destroy it, and Fleet Captain Nine Hibiscus is running out of options. In a desperate attempt at diplomacy with the mysterious invaders, the fleet captain has sent for a diplomatic envoy. Now Mahit Dzmare and Three Seagrass—still reeling from the recent upheaval in the Empire—face the impossible task of trying to communicate with a hostile entity. Whether they succeed or fail could change the fate of Teixcalaan forever.