306 AD. The Roman Empire is unstable and beginning to break, divided by rival rulers and worn down by years of war. When his father dies in Britannia, Constantine is suddenly burdened with responsibility and given command of an army.
He must secure loyalty, outmanoeuvre political enemies, and march across a fragile empire toward a confrontation that could decide Rome's future. But the challenge is not only military. As he campaigns, Constantine begins to question the beliefs he was raised with and wrestles with the meaning of a strange vision that he cannot ignore: a cross in the sky and the words, "By this sign, conquer."
Caught between the honour and duty of Rome and a growing sense that the empire is changing, Constantine must lead his army into battle while trying to understand what he himself believes.
The Eagle and the Cross is a historical fiction novel about power, duty, and one man's struggle at a turning point in history.