When Perennis Felix, favorite of the Roman Emperor and would-be enemy of all, heralds his arrival in Glevum with the capricious execution of a slave, there are few who dare to question his actions. Indeed, a feast in his honor is universally approved in the cause of self-preservation. Libertus, freedman and pavement-maker, and his patron, Marcus Septimus, are among the reluctant citizens at the celebration. But the festivities come to a sudden halt when Felix appears to choke on a nut and dies in front of a stunned gathering. And soon, the ever-vigilant Libertus notices the mysterious disappearance of at least two guests. Is it possible that behind Felix's seemingly accidental death there lies something infinitely more sinister?