Around 70 B.C., a tradeship heading for Rome foundered off the coast of Antikythera. On board was the most sophisticated device known to the classical world: The Antikythera Mechanism - a set of gears that might foretell the ways of the stars. In the sea, the Antikythera Mechanism escaped the purposeful destruction that hit its siblings a hundred years later.
Save for one: The OPUS GEMINI, that has been ruined only twenty years ago. Its rightful owner, Princess Iulia Balbilla, is determined to find it, so that she may restore her power over hearts and minds of the masters of Roma.
Recently, its remains have enhanced the conflict between its current holders, Adrianus and Valeriana. After the recent clash between these foster-siblings, Adrianus finds himself at a place he has never seen before. Meanwhile, the two agents of Commagene are caught in a foreign city. Sedigitus was severely wounded and is doomed to die, if Pernica cannot help him. She, though, is hardly able to survive herself on the perilous streets of Mogontiacum.
The Gears of Fate are turning on ? towards salvation or doom?