Twilight of Empire

When an act of murder throws the western provinces into turmoil, Aurelius Castus is ordered to take command of the military forces on the Rhine. But he soon discovers that the frontier is a place where the boundaries between civilisation and barbarism have little meaning. At the very heart of the conflict are two boys. One is Emperor Constantine's young heir, Crispus. The other is Castus' own beloved son, Sabinus. Only Castus stands between them and men who would kill them.

Aurelius Castus is one of the leading military commanders of an empire riven by civil war, but age is telling upon him. Castus discovers that the emperor's son Crispus aims to depose his ruthless father and restore the old ways of Rome. With a sadistic torturer on his trail, Castus must choose between honour and survival, and face a final confrontation with the most powerful man in the Roman world: the emperor Constantine himself.