Marco gets an unpleasant surprise upon his return to Kublai's court. Kublai faces an impossibly difficult decision.

Haunted by recent events, Kublai journeys with Marco into the mountains for answers. Empress Chabi takes action to insure an heir to the khan.

The challenge for the throne escalates when two of Kublai's sons are endangered. Far away, another threat to the khan is born.

Rebel attacks flare up in the south and pull Kublai's attention away from home. Kokachin gets an unwelcome visitor from her past.

Ahmed's deadly and secret chess match against Kublai enters its endgame, even as Kublai's thirst for power grows stronger than ever.

Kaidu's ruthlessness reaches new levels in his bid for power, while Hundred Eyes' former lover has him questioning his loyalties.

Marco's allegiance to Kublai is tested like never before. Mei Lin's bold move throws Ahmed's plans into chaos.

Marco's past with Kokachin resurfaces. Kublai's position as khan faces a final challenge, even as he welcomes a new heir into the world.

The day of the kurultai arrives, shaping Kublai's fate as khan. Ahmed makes his final stand, and Marco learns a terrible truth.