Marco and Hundred Eyes take on a dangerous mission to infiltrate the walled city of Xiangyang, while its chancellor struggles to hold on to power.

Marco finds his fate in the hands of Kublai yet again, while behind the walls of Xiangyang, Chancellor Sidao sets his sights on regaining power.

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

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