After negotiating a safe passage through the Chola Kingdom, Karikala's son Crown Prince Divakar is provoked into initiating battle with Caesar's 10th Legion as they are marching into Cholan territory as part of the negotiated agreement. Using young King Nedunj's knowledge of Divakar's impetuosity, when the Crown Prince launches an unprovoked attack on the most veteran army in the known world, he is killed by the powerful but volatile substance naphtha, used by Rome to combat the ancient world's most potent superweapon, the armored elephants of the Indian kingdoms. The ramifications of his grisly demise will reverberate, with a king driven mad with grief focusing his blame and hatred on a giant Roman Centurion, blaming Titus Pullus for the death of his son.

After many errors, Caesar must decide between returning the thousand miles back to Pandya as the first leg of what will an arduous journey back to Rome or risk another mutiny by pressing forward. Throughout this extraordinary campaign, Caesar has been able to rely on Titus Pullus and his Equestrians, but that loyalty will be tested as never before if Caesar tries to lead his army beyond the Ganges.