Onyx is a city ruled by the Ophidian Cartel . But to 19 year old Adalie Riva , Onyx is the land of opportunity as she leaves home to become a sultry jazz performer . Adalie is quickly enraptured with the vibrant city from its music , it's food and especially it's danger She becomes emroiled in the city's glitzy underworld , after catching the eye of the Ophidian Cartel's leader , Luca Margaux .