September AD 80. Flavia & her friends go to Rome to celebrate the Festival of Jupiter at Senator Cornixs town house. When a famous racehorse goes missing Nubia sets out to recover it. The four friends find themselves caught up in a plot against one of the rival factions the Greens. Who is trying to sabotage the charioteers? Could it be an inside job or someone with a grudge from long ago? & how many men & horses will die before the killer is caught?