The arrival of a high-ranking spy for the Emperor Severus spells trouble for Libertus in this gripping historical mystery set in 2nd century Britain. On a misty day in February, CE 194, Libertus, pavement maker by trade and now reluctant councillor, is summoned to meet his patron at the local public baths.Marcus Septimus is concerned because a distant cousin from Rome has announced his impending arrival and Marcus is convinced he is a spy for the Emperor Severus, despatched to Glevum to investigate reports of an 'act of treason.'Meanwhile, Libertus has concerns of his own.The local money-lender has been seeking his counsel, but before they can meet, a violent and untimely death occurs . and before long Libertus finds himself a prisoner of his new-found rank, fighting for the truth amidst accusations of treason and murder